The reason I ask is I helped set one up yesterday - and we had to choose what to play first to test it out.
If you mean dialing in the sound and using songs to test the system, either Hooked on a Feeling, (listen for the bongo man), ain’t no sunshine, or Bad.
Myage - Descendents
I usually play Enigma’s first album, because I use it as reference recording to get everything set up. Either that of “Cherish The Day” by Sade. After that, maybe something by Om. https://www.youtube.com/watch?v=kKqoNrZ00Bg
Probably something akin to a left-right audio test so I know the system is working properly.
Tough question…
If I want to test it out it might be something like Tipper.
But, in reality, it would probably be something from my favourite album pile like NIN, Squarepusher, Allman Brothers, Four Tet, Caribou or something from the 90s.