. . . . . "Back Rub is a song from the episode That '90s Show. It is one of five original Simpsons songs not to be composed by regular composer Alf Clausen. The music was instead composed by Clay Duncan and the lyrics by Matt Selman. It is sung by Homer and his group."@en . "Back Rub"@en . . "Back Rub is a song from the episode That '90s Show. It is one of five original Simpsons songs not to be composed by regular composer Alf Clausen. The music was instead composed by Clay Duncan and the lyrics by Matt Selman. It is sung by Homer and his group."@en .