There are millions of demo tapes and CDs from endless ad-hoc bands that were never known, I have myself at least a dozen catchy songs that get in my head from bands I've played in and some I can't even remember who they were, others are on dusty old demo CDs and tapes from 1993 in my basement. The "catchy song that can't be traced" is more than just one song in Rolling Stone, for me it's a whole world of music that existed for only a few months somewhere decades ago that lives only in my mind.