Pearl Jam formed in 1990 in Seattle, Washington. Founder members Jeff Ament and Stone Gossard had previously worked together in Green River and the ill-fated Mother Love Bone. With their highly melodic take on the popular grunge style, blended with influences from the 60s and early 70s, they hit upon a sound that was highly marketable. The critics hailed their debut album and despite Nirvana's Kurt Cobain criticising the band as opportunists, they sold over 10 million copies in the USA alone, making it one of the bestselling rock albums of the modern era. Eddie Vedder's struggles with exhaustion, brought on by an intensive touring schedule, did not prevent the band following up the groundbreaking Ten with another excellent album in 1993, which again sold in its millions. Although their popularity declined towards the end of the 90s, they remained consistent. Pearl Jam collaborated with Neil Young, acting as his backing band for 1995's Mirror Ball. Their albums continued to top the charts well into the new millennium, although they no longer sold in the same vast quantities. In 2010 the band released, Live On Ten Legs, an album that compiled tracks from their tour gigs during the 00s. In 2011 Pearl Jam embarked on their PJ20 World Tour.