Scalaで自動作曲の練習 / A study of automatic composition in Scala

by aereal

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ScalaͰ  ࣗಈ࡞ۂͷ࿅श id:aereal

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ࠓ೔࿩͢͜ͱɾͶΒ͍ • ݹయతͳ࡞ۂͷϝιουͷ঺հ • ͍ΘΏΔʮΫϥγοΫԻָʯͷ࡞Γํ • ↑ΛScalaͰ࣮૷ͨ͠࿩ • ૉ๿ͳ࣮૷Λఏࣔͯ͠ɺ  Իָͷߏ଄ɾϧʔϧͷ͓΋͠Ζ͞Λ஌ͬͯ΄͍͠

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ࠓ೔࿩͞ͳ͍͜ͱ • ϙϐϡϥʔԻָɾδϟζͳͲΑΓۙ୅తͳԻָͷख๏ • ટ๏ (Ϟʔυ)ɺແௐ • ͦͷଞ͍Ζ͍Ζ͋Δख๏ɾϧʔϧ • ָث๏ (orchestration) • ͳʹ͔΋ͷ͔͍͍ͬ͘͢͜͝όʔϯͱ΍͍ͬͯΔײ

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Ϟνϕʔγϣϯ • WebɾจࣈྻͬΆ͍ϓϩάϥϛϯά͔Β཭ΕͯΈ͍ͨ • ͳΜͱͳ͘ػցֶशͱ਌࿨ੑߴͦ͏ • Scalaॻ͖͍ͨ • ࢥߟΛίʔυʹམͱ͠ࠐΉ࿅श

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ࣗಈ࡞ۂͷৄ͍͠ࣄྫ • ͍Ζ͍Ζ࿦จͱ͔͋Δ • ౦ژ᥁ज़େֶͷਓͱ͔͕࿦จΛ͍Ζ͍Ζॻ͍͍ͯΔ • ύοέʔδιϑτ΢ΣΞ΋ച͍ͬͯΔ

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github.com/aereal/music-study

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࡞ۂ? • ΋ͷ͘͢͝೉͍͠ͷͰ͸? • ͍͢͝ਓ͕ײੑΛۦ࢖ͯ͠ર͖ͱڞʹΤΠοͱ΍Δ? • ࣗಈ࡞ۂͬͯͳΜ͔΋ͷ͍͢͝ϊΠζ·ΈΕͳͷͰ͸?

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ݹయతͳԻָͷߏ੒ཁૉ • ટ཯ (melody) • ࿨੠ (harmony) • ཯ಈ (rhythm)

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ݹయతͳԻָͷߏ੒ཁૉ • ͋Δ࣌఺Ͱ໐͍ͬͯΔԻָ = (melody, harmony, rhythm) • Θ͔͖ͬͯͨ

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࿨੠ • ࿨੠͸໐Βͯ͠Α͍Իͷू߹ΛఆΊΔϧʔϧ • → ટ཯΋ӨڹΛड͚Δ • ίΞυϝΠϯͬΆ͍!

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࿨੠ • ໐Βͯ͠Α͍ԻͷϨΠΞ΢τΛܾΊΔϧʔϧ • ਫฏ: ͋ΔԻͷ࣍ʹ໐ͬͯΑ͍Ի͸? • ௐ (key), Ի֊ (scale) • ਨ௚: ͋ΔԻͱಉ࣌ʹ໐ͬͯΑ͍Ի͸? • = ࿨Ի (chord)

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ௐ (key) ͱԻ֊ (scale) • Ի֊: ԻΛԻߴॱʹฒ΂ͨྻ • ྫ: υϨϛϑΝιϥγυ • ௐ: த৺Իͱؔ࿈෇͚

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௕Ի֊ (major scale) 2 2 2 2 2 1 1

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୹Ի֊ (minor scale) 2 2 2 2 2 1 1

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ͭ·Γ? • Ի֊͸ɺج४ͱͳΔԻͱɺԻͷ਺ͱɺ਺ͷൺ͔ΒͳΔ • →ج४ͱͳΔԻΛ༩͑Ε͹ੜ੒Ͱ͖Δ

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࿨Ի • ҟͳΔߴ͞ͷԻ͕ಉ࣌ʹ໐͍ͬͯΔঢ়ଶ • 3ͭͷԻ͔ΒͳΔࡾ࿨Ի (triad) ͕جຊ

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௕ࡾ࿨Ի (major triad) 4 7

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୹ࡾ࿨Ի (minor triad) 3 7

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ͭ·Γ? • ࿨Իͷੑ࣭ = ࿨ԻΛߏ੒͢ΔԻͷൺ • ࠜԻ (root; Ұ൪ԼͷԻ) ͱͷൺͰنఔ͞ΕΔ • → ࠜԻͱ࿨Իͷੑ࣭Λ༩͑Δͱੜ੒Ͱ͖Δ

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ػೳ࿨੠ • ͬ͘͟Γݴ͏ͱɺݱࡏͷঢ়ଶ͔Β࣍ʹͲͷ࿨Իʹਐߦͯ͠ Α͍͔ఆΊͨϧʔϧू • ࿨ԻͦΕͧΕʹػೳ͕͋Δͱߟ͑ͯɺ  ͦͷػೳʹΑͬͯ෼ذ͢Δ • ྫ: ͜ͷ࿨Ի͸ۓு͢ΔͷͰΑΓϦϥοΫεͰ͖Δ࿨Ի ΁ • ίʔυΛݟ·͢

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σϞ

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൓ল • ࠷ॳ͔Βಈ͘ͱ͜Ζ͔Β࡞ΔͱΑ͔ͬͨ…… • ෺ཧతͳͱ͜Ζ (प೾਺) ͔Β࡞͍ͬͯͬͨͷΑ͘ͳ͔ͬ ͨ • ਺஋ͷਫ਼౓……

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ࠓޙͷల๬ • Web Audioͱ݁߹ͯ͠Ի໐Β͍ͨ͠ • ટ཯ͷੜ੒ → ͠ΐ΅ͯ͘΋͍͍ͳΒ͙͢ʹͰ͖ͦ͏