I'll dig out another list of low bass CD's that I only have on paper. As for acoustic instruments it is pretty much a few pipe organs to 16HZ. The extended double bass and contrabassoon bottom at 27Hz. However the big Bosendorfer grand piano has a unique musical "rumble" below 32Hz due to resonating strings tuned below the end of the keyboard. A few years ago I had the chance to use an RTA on one and there was a fair amount of sound in the 16-32 HZ range but not enough to require any kind of sub woofer on top of the Dunlavy SC-V's
Lots of electronica these days has sub sonic electronic drums
Lots of electronica these days has sub sonic electronic drums