Who wrote the song which  Let Me Roll It was released as the B-side to 
Let Me Roll It:  The song was also released as the B-side to "Jet" in early 1974, and has remained a staple of McCartney's live concerts since it was first released. Jet (song): "Jet" is a song by Paul McCartney and Wings from their album "Band on the Run".
Paul McCartney