There is a Commodre 64 theme here, most of these tune send shivers up my spine when I hear them today and I truly believe the C64's SID sound chip was one of the greatest sound generating devices of all time (one of the reasons I own two C64's is because there are 2 models of SID chip.
Ocean Load Music version 4.
This was possibly the very first tune I heard on the Christmas day I got my C64. a great atmospheric tack.
Next an arcade conversion, Outruns famous
Magical Sound Shower (ala SID chip!)
and what SID chip tune article could be complete without possibly the greatest C64 tune of them all,
Sanxion (Load Music)
Hope you enjoy :P