While it is currently a small entry in the streaming market, Prime Music still has the backing of one of the world’s top businesses. Prime Music is not recognized as competition for the major standalone services, but it has the large built-in audience of Prime subscribers. Plus it received an expanded song catalog and adopted playlist features earlier this summer. Amazon recently brought in a new board member with serious music credentials, but there’s no word yet about who might fill Carr’s shoes in growing and promoting the streaming services or about where he will take his skills next.