Jacob Walls <jacobtylerwa...@gmail.com> added the comment:

Unfortunately, at the outset I should have tested this without multiprocessing. 
I can reproduce without multiprocessing[1], which meant I could more easily 
pinpoint the failure. There is an expensive O(nm) algorithm[2] in the music21 
library that is overflowing.

I appreciate your time looking into this. Closing.

Regards, Jacob


[1] in the provided script, after one call to lc.save() call 
lc.rebuildMetadataCache(useMultiprocessing=False)

[2] music21.analysis.discrete.Ambitus.getPitchRanges(), and I plan to do 
something about it.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43802>
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