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RetroTracks Forum - How to Request Tracks
If you would like a new collection or game added then post in this forum with the name of the game or collection, such as "Super Mario" and the platform it was from, for example "SNES" or "Megadrive".
Any other additional information you can provide regarding the collection (especially if it's hard to find) is always useful and will speed up the process of adding it to the site.
Same applies if it's a single (or group of) tracks to add to an existing collection.