Photo: Jim Bennett/WireImage First Oasis’s Zak Starkey, then the Foo Fighters’ Josh Freese , and now our rule of threes for kick-ass Gen-X drummers is complete. Matt Cameron has quit Pearl Jam after nearly 30 years behind the riser for the Seattle rockers. The band announced the decision on social media, where they praised Cameron for being a “singular and true powerhouse of a musician and drummer,” as well as one of their “first musical heroes” for his epochal work in the grunge scene with