Anyone Can Play Guitar

@kevin j m ruby.social kevinjmurphy.com Anyone Can Play Guitar Kevin
Murphy 🎸 🔊 🎛

📷: Fred Seibert CC BY-NC-ND 2.0

📷: Jason Lam CC BY 2.0

📷: Paul Lannuier CC BY-NC-ND 2.0

📷: Bob Bissett Stevie Ray Vaughan CC BY-SA 4.0 I
use heavy strings, tune low, play hard, and fl oor it. Floor it. That's technical talk.

Technical Talk

Kevin Murphy @kevin j m @kevin j [email protected]

@kevin j m ruby.social kevinjmurphy.com Technical Talk class Guitar end

@kevin j m ruby.social kevinjmurphy.com Technical Talk class Guitar def
initialize end end

use heavy strings

@kevin j m ruby.social kevinjmurphy.com Use Heavy Strings class String
end

@kevin j m ruby.social kevinjmurphy.com Use Heavy Strings class GuitarString
end

def heavy? end end

@kevin j m ruby.social kevinjmurphy.com Use Heavy Strings 9 11
16 24 32 42 Common Gauge

@kevin j m ruby.social kevinjmurphy.com Use Heavy Strings 9 11
16 24 32 42 13 15 19 28 38 58 Common Gauge SRV Gauge

def heavy? end end

def heavy? gauge_number > common_gauge_number end end

use heavy strings

@kevin j m ruby.social kevinjmurphy.com 🎸Use Domain Terms

use heavy strings, tune low

@kevin j m ruby.social kevinjmurphy.com Tune Low Standard E B
G D A E

@kevin j m ruby.social kevinjmurphy.com Tune Low Eb Bb Gb
Db Ab Eb Standard Down Half Step E B G D A E

@kevin j m ruby.social kevinjmurphy.com Tune Low class Guitar def
tune end end

tune(tuning = :standard) end end

tune(tuning = :standard) case tuning end end

tune(tuning = :standard) case tuning when :standard standard_tuning end end

tune(tuning = :standard) case tuning when :standard standard_tuning when :down_half_step down_half_step_tuning end end

tune(tuning = :standard) case tuning when :standard standard_tuning when :down_half_step down_half_step_tuning … end end

tune(tuning = :standard) case tuning when :standard when :down_half_step when :drop_d when :open_a when :modal_c end end

tune(tuning = :standard); end end

tune(tuning = :standard); end def standard_tuning; end end

tune(tuning = :standard); end def standard_tuning; end def down_half_step_tuning; end end methods with similar names Pick out

@kevin j m ruby.social kevinjmurphy.com class Guitar def tune(tuning =
:standard); end def standard_tuning; end def down_half_step_tuning; end def drop_d_tuning; end end Tune Low methods with similar names Pick out

tune(tuning = :standard); end def standard_tuning; end def down_half_step_tuning; end def drop_d_tuning; end def open_a_tuning; end end grouped related behavior Pick out

tune(tuning = :standard); end def standard_tuning; end def down_half_step_tuning; end def drop_d_tuning; end def open_a_tuning; end def modal_c_tuning; end end grouped related behavior Pick out

tune(tuning = :standard); end def standard_tuning; end def down_half_step_tuning; end def drop_d_tuning; end def open_a_tuning; end def modal_c_tuning; end … end grouped related behavior Pick out

tune(tuning = :standard) end end

tune(tuning = :standard) Tuner.new end end

tune(tuning = :standard) Tuner.new(self) end end

tune(tuning = :standard) Tuner.new(self) .tune(tuning) end end

use heavy strings, tune low

@kevin j m ruby.social kevinjmurphy.com 🎸Extract Related Behavior

use heavy strings, tune low, play hard

@kevin j m ruby.social kevinjmurphy.com Play Hard > a_string =
GuitarString.new

@kevin j m ruby.social kevinjmurphy.com Play Hard > a_string =
GuitarString.new > a_string.tune(note: :a)

@kevin j m ruby.social kevinjmurphy.com > a_string.pluck(fret: 0) Play Hard

@kevin j m ruby.social kevinjmurphy.com Play Hard A > a_string.pluck(fret:
0) => :a

@kevin j m ruby.social kevinjmurphy.com > a_string.pluck(fret: 1) Play Hard

@kevin j m ruby.social kevinjmurphy.com > a_string.pluck(fret: 1) => :b_flat
Play Hard Bb

@kevin j m ruby.social kevinjmurphy.com > a_string.pluck(fret: 2) => :b
Play Hard B

@kevin j m ruby.social kevinjmurphy.com > a_string.pluck(fret: 3) => :c
Play Hard C

@kevin j m ruby.social kevinjmurphy.com Play Hard class Guitar def
pick(string:, fret:) end end

@kevin j m ruby.social kevinjmurphy.com Play Hard class Guitar def
pick(string:, fret:) @strings[string -1].pluck(fret: fret) end end

use heavy strings, tune low, play hard

@kevin j m ruby.social kevinjmurphy.com 🎸Compose Collaborators

use heavy strings, tune low, play hard, and fl oor it.

@kevin j m ruby.social kevinjmurphy.com Floor It > guitar =
Guitar.new

Guitar.new > guitar.restring(gauge_set: :srv)

Guitar.new > guitar.restring(gauge_set: :srv) > guitar.tune(:down_half_step)

@kevin j m ruby.social kevinjmurphy.com Floor It > song =
Blues::Shuffle.new(guitar)

Blues::Shuffle.new(guitar) > song.play

Blues::Shuffle.new(guitar) > song.play => a, e, g_flat, e, g, e, g_flat, e d, a, b, a, c, a, b, a

@kevin j m ruby.social kevinjmurphy.com > guitar.pick(string: 5, fret: 1)
=> :a Play Hard A2

=> :a Play Hard A3

=> :a Play Hard A3 A2

use heavy strings, tune low, play hard, and fl oor it.

use heavy strings, tune low, play hard, and fl oor it. Floor it.

Blues::Shuffle.new(guitar) > song.play => a2, e3, g_flat3, e3, g3, e3, g_flat3, e3 d3, a3, b3, a3, c4, a3, b3, a3

@kevin j m ruby.social kevinjmurphy.com Floor It class GuitarString def
pluck(fret:) end end

@kevin j m ruby.social kevinjmurphy.com Floor It class GuitarString def
pluck(fret:) [note, octave] end end

@kevin j m ruby.social kevinjmurphy.com Floor It note = guitar.pick(hand_position)

"#{note.first}#{note.last}"

"#{note.first}#{note.last}" unclear names Pick out

@kevin j m ruby.social kevinjmurphy.com class GuitarString def pluck(fret:) end
end [note, octave] Floor It

@kevin j m ruby.social kevinjmurphy.com class GuitarString def pluck(fret:) end
end Note.new(self, fret) Floor It

@kevin j m ruby.social kevinjmurphy.com Floor It class Note def
value; end def octave; end end

@kevin j m ruby.social kevinjmurphy.com note = guitar.pick(hand_position) "#{note.first}#{note.last}" Floor
It

@kevin j m ruby.social kevinjmurphy.com note = guitar.pick(hand_position) "#{note.value}#{note.octave}" Floor
It

value; end def octave; end end

value; end def octave; end def to_s "#{value[0].upcase}#{'b' if flat?}#{octave}" end end

"#{note.value}#{note.octave}"

@kevin j m ruby.social kevinjmurphy.com Floor It guitar.pick(hand_position).to_s

Blues::Shuffle.new(guitar) > song.play => A2, E3, Gb3, E3, G3, E3, Gb3, E3 D3, A3, B3, A3, C4, A3, B3, A3

use heavy strings, tune low, play hard, and fl oor it. Floor it.

@kevin j m ruby.social kevinjmurphy.com 🎸Elevate Primitives to Objects

use heavy strings, tune low, play hard, and fl oor it. Floor it. That's technical talk.

📷: Paul Lannuier CC BY-NC-ND 2.0

@kevin j m ruby.social kevinjmurphy.com 📷: Tony Cuozzo CC BY
2.0

Stevie Ray Vaughan @kevin j m The problem with taking
amps to a shop is that they come back sounding like another amp. 📷: Paul Lannuier CC BY-NC-ND 2.0

@kevin j m ruby.social kevinjmurphy.com Amp class Amplifier end

@kevin j m ruby.social kevinjmurphy.com Amp class Amplifier def amplify(sound)
end end

pre_amp_stage(sound) end end

pre_amp_stage(sound) power_amp_stage(sound) end end

@kevin j m ruby.social kevinjmurphy.com Tube Amp 📷: Kevin Murphy

@kevin j m ruby.social kevinjmurphy.com class TubeAmp end Tube Amp

@kevin j m ruby.social kevinjmurphy.com class TubeAmp def pre_amp_tone end
end Tube Amp

@kevin j m ruby.social kevinjmurphy.com class TubeAmp def pre_amp_tone if
low_volume? || mid_volume? "💡" end end end Tube Amp Volume 0 10 Gain 0 10

@kevin j m ruby.social kevinjmurphy.com class TubeAmp def pre_amp_tone if
low_volume? || mid_volume? "💡" elsif high_volume? "🔥" end end end Tube Amp Volume 0 10 Gain 0 10

@kevin j m ruby.social kevinjmurphy.com Tube Amp > amp =
TubeAmp.new > amp.weight => :heavy

@kevin j m ruby.social kevinjmurphy.com Tube Amp class TubeAmp end

@kevin j m ruby.social kevinjmurphy.com Tube Amp class TubeAmp <
Amplifier end

Amplifier end > amp = TubeAmp.new

Amplifier end > amp = TubeAmp.new > amp.respond_to?(:amplify)

Amplifier end > amp = TubeAmp.new > amp.respond_to?(:amplify) => true

@kevin j m ruby.social kevinjmurphy.com Solid State Amp 📷: Kevin
Murphy

@kevin j m ruby.social kevinjmurphy.com Solid State Amp class SolidStateAmp
end

def pre_amp_tone end end

def pre_amp_tone "🫙" end end

def pre_amp_tone "🫙" end end Volume 0 10 Gain 0 10

@kevin j m ruby.social kevinjmurphy.com Solid State Amp > amp
= SolidStateAmp.new > amp.weight => :light

end

< Amplifier end

< Amplifier end > amp = SolidStateAmp.new

< Amplifier end > amp = SolidStateAmp.new > amp.respond_to?(:amplify)

< Amplifier end > amp = SolidStateAmp.new > amp.respond_to?(:amplify) => true

@kevin j m ruby.social kevinjmurphy.com 🔊Inherit to Specialize

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp 📷: Kevin Murphy

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class HybridAmp end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class HybridAmp <
TubeAmp end

TubeAmp, SolidStateAmp end

TubeAmp, SolidStateAmp end (irb):2: syntax error, unexpected ',' expecting ';' or '\n'

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class Amplifier def
amplify(sound) pre_amp_stage(sound) power_amp_stage(sound) end end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module TubePreAmp end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module TubePreAmp def
pre_amp_tone end end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module TubePreAmp def
pre_amp_tone if low_volume? || mid_volume? "💡" elsif high_volume? "🔥" end end end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class HybridAmp end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class HybridAmp include
TubePreAmp end

TubePreAmp end > amp = HybridAmp.new(volume: 10)

TubePreAmp end > amp = HybridAmp.new(volume: 10) > amp.pre_amp_tone

TubePreAmp end > amp = HybridAmp.new(volume: 10) > amp.pre_amp_tone => "🔥"

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp class Amplifier def
amplify(sound) pre_amp_stage(sound) power_amp_stage(sound) end end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module SolidStatePowerAmp end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module SolidStatePowerAmp def
power_amp_weight end end

@kevin j m ruby.social kevinjmurphy.com Hybrid Amp module SolidStatePowerAmp def
power_amp_weight :light end end

TubePreAmp end

TubePreAmp, SolidStatePowerAmp end

TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10)

TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10) > amp.power_amp_weight

TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10) > amp.power_amp_weight => :light

@kevin j m ruby.social kevinjmurphy.com 🔊Compose to Share Behavior

TubePreAmp, SolidStatePowerAmp end

Amplifier include TubePreAmp, SolidStatePowerAmp end

Amplifier include TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10)

Amplifier include TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10) > amp.respond_to?(:amplify)

Amplifier include TubePreAmp, SolidStatePowerAmp end > amp = HybridAmp.new(volume: 10) > amp.respond_to?(:amplify) => true

Stevie Ray Vaughan @kevin j m I fi gured out
how to get the guitar to rumble. 📷: Paul Lannuier CC BY-NC-ND 2.0

@kevin j m ruby.social kevinjmurphy.com Hear the Rumble > amp
= SolidStateAmp.new(volume: 5)  

= SolidStateAmp.new(volume: 5) > amp.turn_on  

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar)

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar) > song.play { |sound| amp.amplify(sound) }

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar) > song.play { |sound| amp.amplify(sound) } => A2

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar) > song.play { |sound| amp.amplify(sound) } => A2🫙

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar) > song.play { |sound| amp.amplify(sound) } => A2🫙🔊[5]

= SolidStateAmp.new(volume: 5) > amp.turn_on   > guitar = Guitar.new > song = Blues::Shuffle.new(guitar) > song.play { |sound| amp.amplify(sound) } => A2🫙🔊[5]…D3🫙🔊[5]…A2🫙🔊[5]…E3🫙🔊[5]

📷: Kevin Murphy

@kevin j m ruby.social kevinjmurphy.com Hear the Rumble > guitar
= Guitar.new

= Guitar.new > song = Blues::Shuffle.new(guitar)

= Guitar.new > song = Blues::Shuffle.new(guitar) > song.play

@kevin j m ruby.social kevinjmurphy.com Hear the Rumble class Guitar
def initialize end end

def initialize @amplifier = SolidStateAmp.new(volume: 5) end end

def pick(string:, fret:) note = @strings[string -1].pluck(fret: fret) end end

def pick(string:, fret:) note = @strings[string -1].pluck(fret: fret) @amplifier.amplify(note) end end

= Guitar.new

= Guitar.new > song = Blues::Shuffle.new(guitar)

= Guitar.new > song = Blues::Shuffle.new(guitar) > song.play

= Guitar.new > song = Blues::Shuffle.new(guitar) > song.play => A2🫙🔊[5]…D3🫙🔊[5]…A2🫙🔊[5]…E3🫙🔊[5]

def initialize @amplifier = SolidStateAmp.new(volume: 5) end end

def initialize @amplifier = TubeAmp.new(volume: 9) end end

= Guitar.new > song = Blues::Shuffle.new(guitar) > song.play => 🔇🔇[0]…D3💡🔈[1]…A2💡🔉[6]…E3🔥🔊[9]

def initialize @amplifier = TubeAmp.new(volume: 9) end end

def initialize end end

def initialize(amplifier: nil) end end

def initialize(amplifier: nil) @amplifier = amplifier end end

@kevin j m ruby.social kevinjmurphy.com Hear the Rumble > solid_state_amp
= SolidStateAmp.new(volume: 5) > Guitar.new(amplifier: solid_state_amp)

@kevin j m ruby.social kevinjmurphy.com Hear the Rumble > solid_state_amp
= SolidStateAmp.new(volume: 5) > Guitar.new(amplifier: solid_state_amp) > tube_amp = TubeAmp.new(volume: 9) > Guitar.new(amplifier: tube_amp)

@kevin j m ruby.social kevinjmurphy.com 🎛Inject for Flexibility

📷: Bob Bissett CC BY-SA 4.0

@kevin j m ruby.social kevinjmurphy.com Choices, Choices, Choices class HybridAmp
< Amplifier

< Amplifier include TubePreAmp

< Amplifier include TubePreAmp class Guitar def tune = Tuner.new(self).tune

< Amplifier include TubePreAmp class Guitar def tune = Tuner.new(self).tune class Guitar def initialize(amplifier:)

@kevin j m ruby.social kevinjmurphy.com Model YOUR Reality > amp
= HybridAmp.new  

= HybridAmp.new   Consistency 0 10

= HybridAmp.new   Flexibility 0 10

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)  

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   0 10 Flexibility

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   > guitar.tune(:down_half_step)

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   > guitar.tune(:down_half_step) collaborators to extract Pick out

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   > guitar.tune(:down_half_step) > song = Blues::Shuffle.new(guitar)

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   > guitar.tune(:down_half_step) > song = Blues::Shuffle.new(guitar) > song.play

= HybridAmp.new > guitar = Guitar.new(amplifier: amp)   > guitar.tune(:down_half_step) > song = Blues::Shuffle.new(guitar) > song.play => 🔇🔇[0]…D3💡🔈[1]…A2💡🔉[6]…E3🔥🔊[9]

Stevie Ray Vaughan @kevin j m I don't know the
names of what it is I'm doing. 📷: Paul Lannuier CC BY-NC-ND 2.0

Stevie Ray Vaughan @kevin j m I learned how to
make the sounds with my mouth and then copied that with my guitar. 📷: Paul Lannuier CC BY-NC-ND 2.0

@kevin j m ruby.social kevinjmurphy.com Make the Sounds > guitar.plug_in(amplifier:
SonicPiAmp.new)

@kevin j m ruby.social kevinjmurphy.com Make the Sounds > guitar.plug_in(amplifier:
SonicPiAmp.new) > song.play

📷: Kevin Murphy kevinjmurphy.com/play-guitar @kevin j m @kevin j [email protected]

Anyone Can Play Guitar

Anyone Can Play Guitar

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