You could also just emulate what the music would sound like with a stereo system and support head tracking with that. dear reality does something like that with

You could also just emulate what the music would sound like with a stereo system and support head tracking with that. dear reality does something like that with their dearVR digital audio workstation plugins. And then I recall there was this one old Kickstarter project that made headphones with that idea. It had an IR transmitter for head tracking. I think it might be quite difficult to track head movement with just earbuds and not have the tracking drift, though.