single artist movie soundtracks

I just finished watching Harold and Maude and was inspired to make this list.

Best movie soundtracks by a single artist (some that were written specifically for the film, some not):

Harold and Maude, Cat Stevens

Purple Rain, Prince and the Revolution

The Graduate, Simon and Garfunkel

Once, Glen Hansard and Marketa Irglova (this counts as a single artist since they are The Swell Season now)

I really can't think of any more. I thought this would be an easier list to make. Oops.