In the cases of Tiffany, Los Lobos, Idol & Harrison, none of them wrote the songs that Al parodied, however Tommy James and Rudy Clark are duly credited and thanked in the album's liner notes.
Hey, thanks for the quick response, Bermuda! Although I feel a bit
. . .I guess Tommy James IS in the Thanks section. For some reason I thought he wasn't. Sorry.
So to follow up on the Harrison thing, do you know what he thought of Al? Is it true he refused to give permission for the "Pac Man" parody? I know McCartney is a big fan, and I'd like to think George appreciated Al's work, too!