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๐ ๐ผ Using genetic algorithms to improvise over jazz standards

# mjkaufer/jamnetic-algorhythms

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# Jamnetic Algorhythms

Using genetica algorithms to improvise over midi

## Setup

Must use python 3.6

• Run `pip install -r requirements.txt` (or `pip3` if you don't have a virtualenv set up)
• Run `python main.py` or `python3 main.py`
• The pieces will be written out to `/pieces`
• To change the piece being generated, modify the `piece_num` variable to represent the index you want

To add your own pieces, observe `minor_swing.py` and replace the `mxl` file with your musicxml file, and the chord progression with a corresponding chord progression. Then, import your new python file into `main.py`

## Algorithm Thoughts

• GAs for jazz standard - all of me
• melody only tho, but maintain info about chord progressions
• Mutation = take random note in a measure, maybe for 4 random measures
• (should we weight based on note length or nah)
• (or maybe weight based on 'strength' of note position, i.e. notes that fall on beat 1 weighted higher than beats on & of 2)
1. 0.25 probability of picking a random chord tone / note in the key?
• maybe consider whether or not it's on strong beat
• add any domain knowledge, or nah?
• 2a. 0.125 probability of copying a random note already in the measure
• 2b. 0.125 probability of transposing up/down a whole note
• 0.5 up, 0.5 down
• 3a. 0.25 (1 - quanta/4) probability of becoming leading note, chromatic up or down depending on beat?
• quanta = 1 for quarter note, .5 for eighth, etc.
• 3b. 0.25 * (quanta/4) probability of becoming split
• 0.5 prob of even split
• 0.25 of triplet
• 0.25 of dotted and
• 0.5 of short beat first
• 0.5 of long beat first
• apply rules 1,2,4, 7 to new notes
• apply some min/max, where quanta turns to 0 if it's sixteenth note, also no triplet splitting
1. 0.05 probability of picking note from bar with same chord progression
• if no such bars exist, we reweight and ignore this possibility
1. 0.05 probability of shifting all notes
• 0.5 of going to right, 0.5 of going to left
1. 0.05 probability of shuffling notes
• 0.5 of just shuffling notes themselves
• 0.5 of shuffling notes + rhythmic structure
1. 0.05 probability of dropping note
1. 0.05 probability of swapping notes
• Crossover ideas
• split/join
• Take half of bar and combine to half of other bar
• probably better to add whole measures
• alternate every measure?
• take first half from one and second from other?
• reduce
• pick pieces w/ highest fitness, leave in some wonky ones, bc "that's jazz"
• fitness function
• dock points for no note variation
• dock points for all notes identical to original
• dock points for having 0 notes from chord progression
• dock points for only having notes from chord progression
• dock points for too many jumps
• dock points if first note is an ugly interval off chord root (half step, 6 half steps, ignoring notes where it should belong like a maj7 / m7b5) Other thoughts
• add inversions to chords
• consider weighting everything based on quanta & 1-quanta
• have a corpus of jazz standards to borrow phrases from
• add different improvs of all of me to the initial population
• dock points if duration is wonky number
• plus points for repitition of musical phrases / rhythmic combinations?

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๐ ๐ผ Using genetic algorithms to improvise over jazz standards

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