Pearl Jam is an American rock band formed in Seattle, Washington, in 1990. The band's lineup consists of founding members Jeff Ament, Stone Gossard, Mike McCready, and Eddie Vedder, as well as Matt Cameron (drums), who joined in 1998. Keyboardist Boom Gaspar has also been a touring/session member with the band since 2002. Drummers Jack Irons, Dave Krusen, Matt Chamberlain, and Dave Abbruzzese are former members of the band. Pearl Jam outsold many of their contemporaries from the early 1990s, and are considered one of the most influential bands of the decade, being dubbed as "the most popular American rock and roll band of the '90s".