Had to call up a company and their hold music was Metallica’s Enter Sandman. I liked that. Got all the way to the final chorus before I got to the person I needed to talk to. What I find pretty interesting is that the wait time was briefly interrupted by someone picking up, but when they put me back on hold the music picked up where it left off instead of starting from the beginning.
I swear to god when I was working IT, some vendor we worked with had the superman movie theme song as their hold music and I once had to sit through it for 2 fucking hours because none of those lazy motherfuckers were around to answer the phone.