Considering it was 1987 and had to be loaded onto the C64 via tape it had cool music. Here's a youtube link to a guy recreating a section of it and Grim you might get a laugh out of the second one (though the video quality's not great).
YouTube - Wizball theme electric guitar YouTube - Press Play on Tape - Ghost 'n' Goblins
And speaking of being able to change the music, how about
Outrun being able to select the music on the cars radio was a real novelty.