What other band did the member of Pearl Jam who joined after the release of Even Flow play in?
Even Flow:  Featuring lyrics written by vocalist Eddie Vedder and music written by guitarist Stone Gossard, "Even Flow" was released in 1992 as the second single from the band's debut album, "Ten" (1991). Pearl Jam:  The band's fifth member is drummer Matt Cameron (also of Soundgarden), who has been with the band since 1998.
Soundgarden