Maybe this info will be useful to somebody:

"One Note Man" was written by Paul Arnoldi, and performed by him on his album "A One Note Man," 1966.

It is also performed by Swamp Water on 2 albums: "Swamp Water," 1971; and on the various-artists compilation "Fallen Angels," 2000.

Also by The Youngbloods on 3 albums: "Youngbloods," 1967; "Sunlight," 1971; and "Get Together/Elephant Mountain," 1999.

These albums are all classified as "country rock," "folk rock," or "alternative country" by AMG - All Music Guide.