Corruption-free music

GREG: So you won't listen to any band who let their music be used in commercials, movies or TV shows? BRETT: Yes.
BRETT: I need my music to be free of corruption, so I find music that has never and will never be used for any corporate shilling.
GREG: So where d'you find that? BRETT: Mainly shitty open mic nights.
BRETT: Only the truly shitty is truly pure.