Neil Young gets an honorable mention here—once in a while he tagged along and turned them into CSN&Y. (Don’t worry—he also gets his own, much more interesting list). Not much to say about the other three—I think one (Nash, maybe?) hung out with Joni Mitchell for awhile in the 60s. And one of them must have hung out with Judy Collins, because I read somewhere that she’s the Judy Blue Eyes in the title.

Crosby, Stills, & Nash AllMusic page