adamnemecek / AIComposer

AIComposer composes music using a genetic algorithm and MIDI file input.

AIComposer

How to compile and run the preexisting data file:

1. Press the Build and Run button in the upper left-hand corner to start the application up.
2. Under 'File' select 'Open...'.
3. Open "ResultsDataSet.aicomp" located in the projects folder.
4. To listen to the playback of a preexisting composition, select it in the table and click 'Play'.
5. To compose a new piece, enter a number of Genes (20-60 work best) and generations (300-500 work best, BUT take a really long time)

• Click "COMPOSE".
• The field will display information as it runs the algorithm.

Note:

'Compose' will not work in a new file because it requires MIDI files formatted in a specific way as input for both Melodic and Chord Progressions.

Controller Classes

• CompositionController.swift: this contains all of the functions involved with creating music.
• Two genetic algorithms are implemented:
• Main theme creation genetic algorithm
• Composition creation genetic algorithm
• Also contains methods to generate instrument presets and random names.
• Has struct definitions for DesiredResults and CompositionWeights

The Music object structure

• MusicComposition: an complete piece of music with 4 instruments.
• [MusicPart]: an array consisting of the four instrument melodies
• [MusicMeasure]: an array of all of the measures in that instrument's part.
• [MusicNote]: an array of all of the individual notes in each measure. * MusicTimeStamp: a Double representing where in the music sequence the note starts. (1.0 is the length of a quarter note)
  • MIDINoteMessage: the actual MIDI message for the note.
  • channel: UInt8: the MIDI channel number. (0-16)
  • note: UInt8: the MIDI note number. (0-127)
  • velocity: UInt8: the velocity (loudness) of the note. (0-127)
  • releaseVelocity: UInt8: The velocity after the note is released. Always set to 0.
  • duration: Float32: The length of the note in a MIDI sequence.