it would be great to have a way to generate somewhat novel happy high-energy music during coding that won't sap any attention (I'm sort of reluctant to talk to musicians about it, though, because it feels like telling a chef you'd like a way to replace them with a machine that dispenses a constant stream of sugar :P).

I would also love this. I'm in constant deficit of high-energy music for coding or other similar activities, and often it can take more work finding good music for it than all the coding work I want to do while listening to it (or, conversely, it can take much longer to find good music than the music lasts).

One thing I think would be cool would be some sort of audio-generating device/software/thing that allows arbitrary levels of specificity. So, on one extreme, you could completely specify a fully deterministic stream of sound, and, on the other extreme, you could specify nothing and just say "make some sound". Or you could go somewhere in between and specify something along the lines of "play music for X minutes, in a manner evoking emotion Y, using melody Z as the main theme of the piece".