Claim: Jeff Ament has been a member of Pearl Jam since 1990.
Evidence: Along with Stone Gossard , Mike McCready , and Eddie Vedder , he is one of the band 's founding members , and is also known for his work prior to Pearl Jam with the 1980s Seattle-based grunge rock bands Green River and Mother Love Bone , and is particularly notable for his work with the fretless bass , upright bass , and twelve-string bass guitar.
Pearl Jam is an American rock band formed in Seattle , Washington , in 1990.
Since its inception , the band 's line-up has comprised Eddie Vedder -LRB- lead vocals -RRB- , Mike McCready -LRB- lead guitar -RRB- , Stone Gossard -LRB- rhythm guitar -RRB- and Jeff Ament -LRB- bass -RRB-.