#6 Rhythm things

[Miguel Haruki Yamaguchi]

This is something I've been thinking of for a while but what say people about
having a drum machine-ish thing or generator for rhythms?

Like pass in an enum value (can represent 4/4 time, 7/8, 6/8, etc),
then have the class generate some beats.

This can be then returned as a Part to add into a Score object.

I'll make a prototype this week..