Thread by @pookleblinky

A 5 note melodic cell has 120 permutations.

A ii-V-I progression made of such cells has 120^3 permutations: 1,728,000

There are 1.7 million ii-V-I melodic skeletons generated by simply permuting 5 notes per chord.

Generate a ii-V-i for a given i.

For each chord, randomly permute a 5 note melodic cell.

Result: 1.7 million skeletons of bebop lines.

Bump it up to 7 notes per cell: 5,040 permutations per chord, 128,024,064,000 possible ii-V-is

Each ii-V-I melodic skeleton would be 15 notes.

Now you can embellish them. Give each note a time value, and then emphasize the chord notes. Add passing notes. Make 2 or 3 cells per chord, etc

Once one ii-V-i is generated, move a tritone away and generate a new one.

Coltrane changes, with no AI behind em at all.

Embellishing these melodic skeletons comes down to assigning time values to each note and then altering them, and adding chromatic passing notes between each cell.

Now you're producing recognizable bebop melodies without any AI involved.

Output it as json for conversion into midi or note typesetting.