You must have exclusive copyright rights to the material in the reference file for the territories where you claim ownership. Sound recordings submitted should be fully distinct, and not contain any open or unlicensed samples, sound effects, sound bites, beats, royalty-free music, etc.
The following examples are ineligible for use in or as a reference:
More information about this from YouTube can be found via the link: https://support.google.com/youtube/answer/2605065?hl=en
Original Video Game Soundtracks are only valid references when owned by the video game’s publisher.
Original Video Game Soundtracks are sound recordings created primarily for use in a video game, such as the original score or background music accompanying a video game.
These references are only valid when delivered under the video game publisher’s content owner.
All reference content must be sufficiently distinct.
The following examples are ineligible for use in or as a reference: