Influenced by early-rock-and-roll and rhythm-and-blues artists, including groups such as The Beatles, The Drifters and The Four Seasons, he favored tightly-structured pop melodies and down-to-earth, unpretentious songwriting.  After seeing The Beatles on The Ed Sullivan Show, Joel decided to pursue a career in music. In an interview he said of the group's impact, "That one performance changed my life ... Up to that moment I'd never considered playing rock as a career. And when I saw four guys who didn't look like they'd come out of the Hollywood star mill, who played their own songs and instruments, and especially because you could see this look in John Lennon's face - and he looked like he was always saying: 'F--- you!' - I said: 'I know these guys, I can relate to these guys, I am these guys.' This is what I'm going to do - play in a rock band'."  Joel joined the Echoes, a group that specialized in British Invasion covers. The Echoes began recording in 1965. Joel (then 16) also played piano on several records released through Kama Sutra Productions and on recordings produced by Shadow Morton. Joel played on a demo version of "Leader of the Pack", which would become a major hit for the Shangri-Las. Joel states that in 1964 he played on a recording of the Shangri-Las' "Remember (Walking in the Sand)" but he is unaware of whether he played on the demo or master version; The released single included a co-producer credit for Artie Ripp, who later was the first to sign and produce Joel as a solo artist after Michael Lang, who had given Joel a monetary advance, passed Joel along to Ripp to focus his attentions elsewhere instead.  In late 1965, the Echoes changed their name to the Emeralds and then to the Lost Souls. Joel left the band in 1967 to join the Hassles, a Long Island group that had signed with United Artists Records. Over the next year and a half they released four singles and two albums (The Hassles and Hour of the Wolf). All were commercial failures. Joel and drummer Jon Small left the Hassles in 1969 to form the duo Attila, releasing an eponymous debut album in July 1970. The duo disbanded the following October when Joel began an affair with Small's wife, Elizabeth, whom Joel eventually married.

Answer this question "Did he stay with that group long?" by extracting the answer from the text above.
Over the next year and a half they released four singles and two albums (The Hassles and Hour of the Wolf). All were commercial failures.