Superior

Purple Rain

Prince & The Revolution WARNER BROS, 1984

Slightly different from the other soundtracks in this list, in that it comprises only songs by one artist. But as both a film soundtrack and standalone album it works perfectly. The, kicking back with or letting rip with the climactic title track, which on the album (unlike the single release) features the most amazing extended guitar solo. The film may be dodgy, but the music certainly isn't.