Commercially, interest in acoustic folk groups was waning. Weissberg developed a career as a session musician, playing on albums by The Clancy Brothers, Doc Watson, Melanie, Billy Joel, Frankie Valli, Bob Dylan, Loudon Wainwright III, Talking Heads, Tom Paxton, Jim Croce, Art Garfunkel, John Denver, Ronnie Gilbert, and others. He was well known for playing the banjo solo in "Dueling Banjos", used as the theme in the film Deliverance (1972), produced by Joe Boyd and directed by John Boorman. It was released later as a single and became a hit; playing on Top 40, AOR, and country stations alike. It reached the Top Ten and hit #2 in the US and Canada. The song also won the 1974 Grammy Award for Best Country Instrumental Performance. Weissberg released a related album, called Dueling Banjos: From the Original Motion Picture Soundtrack 'Deliverance' (1973), which also became a hit. The album was made up mostly of tracks which Weissberg had recorded on New Dimensions in Banjo and Bluegrass (1963), with Marshall Brickman and Clarence White. (Also a screenwriter, Brickman later received an Oscar for Annie Hall.) They removed two tracks from the 1963 album and added the track for "Dueling Banjos," releasing it under the new name. One of the original 1963 tracks on the new album, "Shuckin' The Corn," was later sampled by Beastie Boys on the track "5-Piece Chicken Dinner" from their album Paul's Boutique. Warner Brothers was sued by Arthur "Guitar Boogie" Smith, the composer of "Feudin' Banjos", which he had written and recorded in 1955. It was renamed as "Dueling Banjos" in the movie. He won a "substantial settlement," which included appended film credit for the song and a portion of royalties. Continuing to play folk festivals, Weissberg was nearly as well known in that venue for his dobro guitar as for his bluegrass banjo playing. He also recorded with jazz musicians Herbie Mann and Bob James. In 1998, he joined Richard Thompson and dozens of other folk musicians on Nanci Griffith's album, Other Voices Too. He often toured with Tom Paxton. They frequently played a variant of "Dueling Banjos" in the set, in addition to Paxton's material. On February 12, 2009, Weissberg performed at the Riverside Church in New York City with the Aaron Copland School of Music at Queens College orchestra and chorus, along with the Riverside Inspirational Choir and NYC Labor Choir, to honor President Abraham