After two years at art school, he spent time in Paris before returning to the Boston area, where he began performing in coffee houses, singing and playing banjo and guitar.
He appeared in D.A. Pennebaker’s 1967 Dylan documentary, “Dont Look Back,” as well as in “Eat the Document” (1972), a documentary of a later tour that was shot by Mr. Pennebaker and later edited by Mr. Dylan, who is credited as the director, and Mr. Dylan’s “Renaldo & Clara” (1978), most of which was filmed during the Rolling Thunder tour. He also appeared in “Rolling Thunder Revue: A Bob Dylan Story,” the 2019 Martin Scorsese film.
Mr. Neuwirth was a producer of “Down From the Mountain” (2000), a documentary, directed in part by Mr. Pennebaker, about a concert featuring the musical artists heard in the Coen Brothers’ movie “O Brother, Where Art Thou?”
“It’s all about the same to me,” he said, “whether it’s writing a song or making a painting or doing a film. It’s all just storytelling.”
Mr. Neuwirth, who lived in Santa Monica, is survived by Ms. Batson.
Mr. Neuwirth could be self-deprecating about his own musical efforts. He called his collaboration with Mr. Vitier, the Cuban pianist, “Cubilly music.” But his music was often serious. The Cale collaboration was a sort of song cycle that, as Jon Pareles wrote in The New York Times when the two performed selections in concert in 1990, “added up to a shrug of the shoulders in the face of impending doom.”
“Instead of breast-beating or simply wisecracking,” Mr. Pareles wrote of the work, “it found an emotional territory somewhere between fatalism and denial — still uneasy but not quite resigned.”
