as a long ago band/orchestra drummer (3rd grade to 8th, HS band was def not in my stoner profile by then) I recognized the training your boy is getting in rudiments and such. It was a bit like watching marching band tomtom player meshed with neil pert lol. Get that kid a kit and lets see you rip on TWO sets, Mickey Hart/Bill Kreuzman style (grateful dead's two drummers) I understand they take turns dividing the work into the rhythm line and the fill guy. So one is laying down the core beat and the other is noodling on toys and triangles and gongs and cowbells and all that "assorted perc" stuff. but they swap out and thats how they avoid getting tired during 4 hour non stop sets of 20 minute tunes