Though not acclaimed for his music, his art has long been "music-adjacent": R. Crumb. The documentary is entitled Crumb, made by his friend Terry Zwigoff. His record collection (shown in the film) appears to be entirely 78's (played on a Lenco table, iirc), recordings of "old timey" music from the early part of the 20th century. His view and opinion of the San Francisco bands he was surrounded by (expressed in the film) are really funny. He probably approves of Dan Hicks & His Hot Licks.