Canned Heat. When I was a teenager at school I used to hitch everywhere and On the Road Again was my theme. Al Wilson the singer harmonica player in this was an impressive young man. Musicologist multi instrumentalist and environmentalist he died September 1970 at the age of 27. He was an original vocalist with a falsetto style that suited the material. Here's a short playlist of his vocals, and a couple of Hooker n Heat tunes.