Guitarist Robby Krieger is responsible for all guitar parts on "Roadhouse Blues"; Morrison shouts "Do it, Robby, do it!" (especially audible on the official audio proof of DVD-Audio and Super Audio CD where the single vocal track can be separated from other instruments) at the start of the guitar solo. Ray Manzarek switched from a Wurlitzer electric piano to a tack piano (the same type as used on the Beach Boys' "Good Vibrations"). Ex-Lovin' Spoonful frontman John Sebastian contributed harmonica (listed as "G. Puglese" for contractual reasons).