Wiktionary
backing band
n. (context British English) A group of musicians who accompany an artist at a live performance or on a recording. This can either be an established group, or else an ad hoc group assembled for the purpose.
Usage examples of "backing band".
James Brown called out and his backing band, the Famous Flames, responded to his every vocal nuance.
All he needs is a decent backing band, and he could get on Top Of The Pops easy.