The one song I test all my boxes with is an oldie but goodie from my fav decade, the 70's.
Cosmic Slop by Funkadelic, live from Madison Square Garden off of the out-of-print album "The Best of Funkadelic."

With the wild midrange synths of Bernie Worrell, Bootsy Collins' rock-solid bass, and Eddie Hazel & Mike Hampton's screaming, treble-y guitars, this track has everything in it to test all the aspects of a top-of-the line boomboxes vital statistic, it's sound. A sample of this song can be found on YouTube in a live version from a Houston P-Funk explosion, just George & Co. doin' their thang that they did so well, namely bringing "The Bomb" down upon unsuspecting audiences.
In fact, just testing my newly-repaired Big Ben with it yesterday, I blew up a tweeter...
