I just added this site to the Links section.

http://www.nino.com.br/site.html

This site features tons of mp3's free to download which cover the
greatest gaming tracks of all time.

Some of the games included which appeared on Turbo/PCE are-

Ninja Gaiden
Street Fighter II'
Strider
Gradius
Castlevanias
Golden Axe
Altered Beast
Fatal Fury
R-Type
After Burner
Valis
Double Dragon
Splatterhouse

A couple games listed are prequels, but I imagine that the hit songs
made it into newer games.

This is the only place to hear a death metal cover of Alex Kidd In
Miracle World.

If you like what you here, check their links section and you'll find
a special version of MAME that will play some of the games(like
Contra) covered with the mp3 soundtrack.