Any come to mind? They don't have to be terrible songs, just simplistic, old-school or not very impressive to listen to in SID format -- but with a neat catchy little tune. Perfect candidates for 1:1 remakes.
Maybe something that sticks in your head -

Or Mail Order Monsters - http://fonix.dyndns.org:40000/soasc/MOS ... 01.sid.mp3
Or for non C64 specific to give you an idea....the background tunes from Dig Dug or Xevious (for Xevious include both intro and background tracks). Ahhhh! Can't get them out of my head! Burgertime -- ahhhh!

Could be something really long and detailed, too, just...simple...without all of the cool advances and expert techniques in SID sound. Say like the Ultima 3-5 tunes.
Links from Stone Oakvalley's authentic SID collection... http://fonix.dyndns.org:40000/soasc/ind ... r+monsters
