These are called Performance Rights Organizations. They collect your performance and mechanical royalties. This means whenever your music is sold (CD or downloads), streamed "on demand" or on radio. They do NOT collect streaming royalties.
Songtrust is a third-party publishing administrator. They collect streaming royalties that DistroKid does not. When you register your songs with Songtrust, they also automatically register those songs with your PRO (like BMI or ASCAP).
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