"Proud Mary" is a song by Creedence Clearwater Revival that ALF and Lynn sing together in the garage (Episode: "A.L.F.").
ALF & Lynn:They sing the first few lines of the song:
"Big wheel keep on turnin'.
Proud Mary keep on burin'.
Rollin', rollin', rollin' on a river."
just rolling on that river
Proud Mary keep on burnin lynn is still turnin
rollin,rollin rollin rolling with Alf
chorus lynn and Alf
still rolling oh yeah but keep on turning