<P> In December 1969, Harrison participated in a brief tour of Europe with the American group Delaney & Bonnie and Friends . During the tour that included Clapton, Bobby Whitlock, drummer Jim Gordon and band leaders Delaney and Bonnie Bramlett, Harrison began to write "My Sweet Lord", which became his first single as a solo artist . Delaney Bramlett inspired Harrison to learn slide guitar, significantly influencing his later music . </P> <P> For many years, Harrison was restricted in his songwriting contributions to the Beatles' albums, but he released All Things Must Pass, a triple album with two discs of his songs and the third of recordings of Harrison jamming with friends . The album was regarded by many as his best work, and it topped the charts on both sides of the Atlantic . The LP produced the number - one hit single "My Sweet Lord" and the top - ten single "What Is Life". The album was co-produced by Phil Spector using his "Wall of Sound" approach, and the musicians included Starr, Clapton, Gary Wright, Preston, Klaus Voormann, the whole of Delaney and Bonnie's Friends band and the Apple group Badfinger . On release, All Things Must Pass was received with critical acclaim; Ben Gerson of Rolling Stone described it as being "of classic Spectorian proportions, Wagnerian, Brucknerian, the music of mountain tops and vast horizons". Author and musicologist Ian Inglis considers the lyrics of the album's title track "a recognition of the impermanence of human existence...a simple and poignant conclusion" to Harrison's former band . In 1971, Bright Tunes sued Harrison for copyright infringement over "My Sweet Lord", owing to its similarity to the 1963 Chiffons hit "He's So Fine". When the case was heard in the United States district court in 1976, he denied deliberately plagiarising the song, but lost the case, as the judge ruled that he had done so subconsciously . </P> <P> In 2000, Apple Records released a thirtieth anniversary edition of the album, and Harrison actively participated in its promotion . In an interview, he reflected on the work: "It's just something that was like my continuation from the Beatles, really . It was me sort of getting out of the Beatles and just going my own way...it was a very happy occasion ." He commented on the production: "Well, in those days it was like the reverb was kind of used a bit more than what I would do now . In fact, I don't use reverb at all . I can't stand it...You know, it's hard to go back to anything thirty years later and expect it to be how you would want it now ." </P> <P> Harrison responded to a request from Ravi Shankar by organising a charity event, the Concert for Bangladesh, which took place on 1 August 1971 . The event drew over 40,000 people to two shows in New York's Madison Square Garden . The goal of the event was to raise money to aid starving refugees during the Bangladesh Liberation War . Shankar opened the show, which featured popular musicians such as Dylan, Clapton, Leon Russell, Badfinger, Preston and Starr . </P>

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