Depends upon what music your friends like? Telarc's Time Warp CD is one of my favorite old demo's covering a range from synth to classic; a lot of orchestral fireworks! Then there's the 1812 Overture which has recently been re-recorded. Alan Parson's - I Robot. Joe Walsh - The Confessor. Stevie Nicks' Enchanted boxed set of 3 is a wonderful HDCD. There's just so many; these are a few that come to mind.
