User:Gwern/Haskore

Haskore is a set of Haskell modules for creating music as MIDI, CSound, SuperCollider^[1] Audio files. Because of the programming style of Haskell, the composer user can concentrate on composing rather than programming. Nevertheless the music author can benefit from the functional programming. Haskore was created by Paul Hudak at Yale in 1996.

Examples[edit]

Haskore is free use. An example ChildSong6.lhs from the official archive which contains a partial encoding of Chick Corea's "Children's Song No. 6" is:

module ChildSong6 where
import Haskore

-- note updaters for mappings
fd d n = n d v
vol  n = n   v
v      = [Volume 80]
lmap f l = line (map f l)

-- repeat something n times
times  1    m = m
times (n+1) m = m :+: (times n m)

-- Baseline:
b1 = lmap (fd dqn) [b  3, fs 4, g  4, fs 4]
b2 = lmap (fd dqn) [b  3, es 4, fs 4, es 4]
b3 = lmap (fd dqn) [as 3, fs 4, g  4, fs 4]

bassLine = times 3 b1 :+: times 2 b2 :+: times 4 b3 :+: times 5 b1

-- Main Voice:
v1  = v1a :+: v1b
v1a = lmap (fd en) [a 5, e 5, d 5, fs 5, cs 5, b 4, e 5, b 4]
v1b = lmap vol    [cs 5 tn, d 5 (qn-tn), cs 5 en, b 4 en]

v2  = v2a :+: v2b :+: v2c :+: v2d :+: v2e :+: v2f
v2a = lmap vol [cs 5 (dhn+dhn), d 5 dhn,
                 f 5 hn, gs 5 qn, fs 5 (hn+en), g 5 en]
v2b = lmap (fd en) [fs 5, e 5, cs 5, as 4] :+: a 4 dqn v :+:
      lmap (fd en) [as 4, cs 5, fs 5, e 5, fs 5, g 5, as 5]
v2c = lmap vol [cs 6 (hn+en), d 6 en, cs 6 en, e 5 en] :+: enr :+:
      lmap vol [as 5 en, a 5 en, g 5 en, d 5 qn, c 5 en, cs 5 en]
v2d = lmap (fd en) [fs 5, cs 5, e 5, cs 5, a 4, as 4, d 5, e 5, fs 5] :+:
      lmap vol [fs 5 tn, e 5 (qn-tn), d 5 en, e 5 tn, d 5 (qn-tn),
                cs 5 en, d 5 tn, cs 5 (qn-tn), b 4 (en+hn)]
v2e = lmap vol [cs 5 en, b 4 en, fs 5 en, a 5 en, b 5 (hn+qn), a 5 en,
                fs 5 en, e 5 qn, d 5 en, fs 5 en, e 5 hn, d 5 hn, fs 5 qn]
v2f = Tempo (3/2) (lmap vol [cs 5 en, d 5 en, cs 5 en]) :+: b 4 (3*dhn+hn) v

mainVoice = times 3 v1 :+: v2

-- Putting it all together:
childSong6 = Instr "piano" (Tempo 3 (Phrase [Dyn SF] bassLine :=: mainVoice))

References[edit]

Paul Hudak, The Haskell School of Expression: Learning Functional Programming Through Multimedia, Cambridge University Press, 2000, ISBN 0521643384.

External links[edit]

Category:Domain-specific programming languages Category:Audio programming languages Category:Free Haskell software

^ See the haskore-supercollider package.

[1] See the haskore-supercollider package.

[1]