Michael, isn't it customary to list all the backup musicians in the song credits along with the lead singer/instrumentalist? At least when there are only a few of them?

E.g.

"THE MORNING AFTER"
(A. Drunkin Saylor)

Billy Budd: vocals
Captain Ahab: nose flute
Davy Jones: concertina


Perhaps if there's a whole band as backup, the credits might just list the band name, but I usually see the backup vocalists & instrumentalists credited if there are only a few of them.