15 Beats per bar is a flexible pallet from which to write drum and percussion parts.

Jo Morello and Dave Brubeck used it on Take Five.

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Jo (or is it Joe) Morello uses a structure based 15|8 (or 5|4)  time signature. …on a sequence of accents spaced by 5 sub divisions (quaver triplets), then 4, then 3, 2, and finishes each bar with a pickup q.triplet back to 1 of next bar. Effectively creating an cyclic ‘acceleration’ illusion.  

Makes a great practice exercise using single strokes…accenting the triplets 5 then 4 etc…moving from hand to hand…or foot to foot as the accents cycle…takes two bars to loop fully back.

Examples of ‘15’

https://youtu.be/tT9Eh8wNMkw?si=_i6IU_FSjF8Xq2aj

15 divides in many ways.

Here is a piece I wrote for my Daughter which is based on 3+3+3+2+2+2

https://symmetricaldrummingaustralia.org/track/3338906/maire

Have a listen.  Work on your ‘15's’…