Amazon, which offers a free streaming music service with a limited catalog to subscribers of its Prime shipping and video service, did not respond to a request for comment about the new, full-fledged music plan.
Although it will be a late entrant to the crowded streaming space, Amazon believes a comprehensive music service is important to its bid to be a one-stop shop for content and goods, the sources said.
The new music offering also is intended to increase the appeal of the Amazon Echo, its home speaker, which searches the Internet and orders products from the retailer with voice commands.
"A music service will further increase the daily interactions between Amazon and its customer base," said former music executive Jay Samit when told about the company's plan.
The new Amazon effort will compete directly with Apple Music and Spotify, which boast more than 30 million songs. Apple launched its service last year in one of the highest profile signs that listeners wanted subscription services, rather than paying for individual songs or albums.
The service also will diversify Amazon's subscription offerings and be another step away from a single, annual subscription. Amazon recently began allowing subscribers to Prime to pay monthly, for instance.