Answer by taking a quote from the following article:

At Fillmore East is the first live album by American rock band the Allman Brothers Band, and their third release overall. Produced by Tom Dowd, the album was released in July 1971 in the United States by Capricorn Records. As the title indicates, the recording took place at the New York City music venue Fillmore East, which was run by concert promoter Bill Graham. It was recorded over the course of three nights in March 1971 and features the band performing extended jam versions of songs such as "Whipping Post", "

Shortly after completing recording of their second album, Idlewild South (1970), band leader Duane Allman was contacted by guitarist Eric Clapton to contribute to his new project, Derek and the Dominos. Allman was a huge fan of his work with the band Cream, and likewise Clapton enjoyed Allman's session work on Wilson Pickett's "Hey Jude" some years prior. They met after a show one night in Miami and had a jam session together until the next afternoon, with the two guitarists regarding one another as "instant soulmates." Clapton invited Duane to join Derek and the Dominos, and according to band biographer Alan Paul he considered it; in the end, he declined and rejoined the Allman Brothers Band, returning after missing a string of several shows. The sessions were collected on the album Layla and Other Assorted Love Songs, issued that November.  In the interim, Idlewild South had yet to achieve strong commercial success, but the band's popularity and reputation began to increase due to their live performances. The band played continuously in 1970, performing over 300 dates on the road traveling in a Ford Econoline van and later, a Winnebago, nicknamed the Wind Bag. During this time, the group began struggling with drug addictions. Everyone in the group, with the exception of the brothers, was also struggling to make a living (vocalist Gregg Allman received more money from royalty payments and Duane more from session work). In one incident, tour manager Twiggs Lyndon stabbed and killed a promoter for not paying the band; he later claimed temporary insanity. Their fortunes began to change over the course of 1971, where the band's average earnings doubled.  The Allman Brothers Band had first played Fillmore East in December 1969, opening for Blood, Sweat & Tears for three nights. Promoter Bill Graham enjoyed the band and promised to have them back soon. In January 1970, the band opened for Buddy Guy and B.B. King at San Francisco's Fillmore West, and one month later at Fillmore East supporting the Grateful Dead. According to biographer Alan Paul, "these shows were crucial in establishing the band and exposing them to a wider, sympathetic audience on both coasts." Drummer Butch Trucks considered their performances at the Fillmore East to be the launching pad for their success. In 1970, Duane Allman told disc jockey Ed Shane, "You know, we get kind of frustrated doing the [studio] records, and I think, consequently, our next album will be ... a live recording, to get some of that natural fire on it." "We were not intentionally trying to buck the system, but keeping each song down to 3:14 just didn't work for us," remembered Gregg Allman. "And we realized that the audience was a big part of what we did, which couldn't be duplicated in a studio. A lightbulb finally went off; we needed to make a live album."

How did Eric Clapton influence them?
had a jam session together until the next afternoon, with the two guitarists regarding one another as "instant soulmates.