Prince’s vast musical tree includes a long of line of what can only be called spin-offs — artists who once appeared with, played with or worked with Prince, then went on to their own solo careers. Their degrees of success varied. I remember seeing former Prince guitarist Andre Simone play Oklahoma City (alongside Klymaxx, Zapp, and the Gap Band) in about 1986, but otherwise haven’t heard from him. There are Prince’s female players — Apollonia, Vanity, Sheila E. — who had impressive, if limited, careers. But the most memorable has to be Morris Day and the Time, who played the rival band in the movie “Purple Rain,” and stole every scene in which they appeared.