detecting the tempo of a rhythm a drummer is playing in real time (including tracking variations/drift in tempo) based on the time stamps of each drum hit (and starting at an assumed tempo). I've found in depth resource on problems that are similar, but not the same (wave form data rather than time stamps, all-at-once rather than real time, etc). I'm trying to keep myself open to the fact that the solution might be incredibly simple, and just unrelated to any path I've gone down, but it's led me down some interesting paths that I'm enjoying, so also just taking that for what it's worth