Star Fighter (1995)
As much as us retro gamers loved and continue to love chiptunes, it wasn't until CD-based games started appearing that we had the first 'proper' soundtracks composed by real instruments or featuring samples, voices, or anything else the composers cared to add - the limits, in other words, were now non-existent. One of the earliest examples of this kind of soundtrack that I really liked was found in Fednet's stonking 3D shmup, Star Fighter. Composed by John Avery, it consists of nine techno/trance tracks (I've never been great at differentiating the many sub-genres of 'electronic music') which the game cycles through as you play (and you can jiggle the order around as you please). All of them are superb but I think my favourite is this one...
(full Star Fighter review here)
Special Note: I didn't record this great tune myself, I'm just an admirer, so all credit to the splendid Mr. Avery, as well as my thanks for making such a great soundtrack to start with!