If your music is selling or streaming on any basic retailer platform - iTunes, Spotify, Amazon, Google Play, Rhapsody, etc - you are entitled to master-generated royalties.
Master-generated royalties, also known as recording royalties, are royalties generated on behalf of the sound recording / master recording (rather than the composition) from physical/download sales and streams.
This kind of royalty is the most basic royalty performing artists and labels get every time their master recording is downloaded (ex. iTunes) physically bought, or streamed (ex. Spotify, Apple Music, Tidal, etc...)
If you are based in the U.S., we recommend you register with SoundExchange as they will collect all master-generated royalties for you. Songtrust does not collect any master-generated royalties.