Pearl Jam is an American rock band formed in Seattle, Washington, in 1990. Since its inception, the band's line-up has consisted of Eddie Vedder (lead vocals), Mike McCready (lead guitar), Stone Gossard (rhythm guitar) and Jeff Ament (bass). The band's fifth member is drummer Matt Cameron (also of Soundgarden), who has been with the band since 1998. Boom Gaspar (piano) has also been a session/touring member with the band since 2002.

Compared with the other grunge bands of the early 1990s, Pearl Jam's style is noticeably less heavy and harkens back to the classic rock music of the 1970s. Pearl Jam has cited many punk rock and classic rock bands as influences, including The Who, Led Zeppelin, Neil Young, Kiss and the Ramones. Pearl Jam's success has been attributed to its sound, which fuses "the riff-heavy stadium rock of the '70s with the grit and anger of '80s post-punk, without ever neglecting hooks and choruses." Gossard's rhythm guitar style is known for its sense of beat and groove, while McCready's lead guitar style, influenced by artists such as Jimi Hendrix, has been described as "feel-oriented" and "rootsy."  Pearl Jam has broadened its musical range with subsequent releases. As he had more influence on the band's sound, Vedder sought to make the band's musical output less catchy. He said, "I felt that with more popularity, we were going to be crushed, our heads were going to pop like grapes." By 1994's Vitalogy, the band began to incorporate more punk influences into its music. The band's 1996 album, No Code, was a deliberate break from the musical style of Ten. The songs on the album featured elements of garage rock, worldbeat, and experimentalism. After Yield in 1998, which was somewhat of a return to the straightforward rock approach of the band's early work, they dabbled with experimental art rock on the Binaural album of 2000, and with folk rock elements on the 2002 Riot Act album. The band's 2006 album, Pearl Jam, was cited as a return to their early sound. Their 2009 album, Backspacer, contains elements of pop and new wave.  Critic Jim DeRogatis describes Vedder's vocals as a "Jim Morrison-like vocal growl." Greg Prato of AllMusic said, "With his hard-hitting and often confessional lyrical style and Jim Morrison-esque baritone, Vedder also became one of the most copied lead singers in all of rock." Vedder's lyrical topics range from personal ("Alive", "Better Man") to social and political concerns ("Even Flow", "World Wide Suicide"). His lyrics have often invoked the use of storytelling and have included themes of freedom, individualism, and sympathy for troubled individuals. When the band started, Gossard and McCready were clearly designated as rhythm and lead guitarists, respectively. The dynamic began to change when Vedder started to play more rhythm guitar during the Vitalogy era. McCready said in 2006, "Even though there are three guitars, I think there's maybe more room now. Stone will pull back and play a two-note line and Ed will do a power chord thing, and I fit into all that."

Using a quote from the above article, answer the following question: Who has copied Vedder?