Drum kit: https://www.dropbox.com/s/0ffjs477rrr1yc8/sample.drm?dl=0 (pretty large-50megs)
So what we have here is the fully instrumented backing track of Reelin in the Years - Steely Dan.
Since you don’t want to continually loop the 4 minute wav file, the main loops is a single metronome click. Hit a fill to play the whole song, then end when it’s done.
The drum kit is just two instruments: the metronome, and the sample.
The main loop is a midi that triggers one metronome hit, and the fill is a loop that triggers the sample.
Swap out samples, and you can have any song or backing track. If you want the track to loop, of course, put it as the instrument in the main loop