Last month Amazon officially launched its Prime music service, offering its Prime subscribers unlimited, ad-free streaming. Today, the company has announced the library of songs users have to choose from is expanding dramatically along with some additional enhancements to the service.

Prime members already had access to over a million tracks when the service launched on June 12, and today Amazon has added "hundreds of thousands" of new songs to the mix. The additional tracks are from artists that are already in the catologue as well some new talent including Miles Davis, Kendrick Lamar, Linkin Park, Shakira, Deadmau5, Ella Fitzgerald, Young the Giant, A$AP Rocky, Oasis, Ray Charles, Skrillex, John Coltrane and many others.

Amazon said users are really pleased with its curated Prime Playlists and have decided to add hundreds of new ones. A few examples the company gives are “Upbeat Indie Vibes,” “Electronic Beats for Work,” “Rainy Day Jazz,” “Jack White and More,” “Bass Drops and Fist-Pumps,” and “Justin Timberlake’s Top Songs.”

Prime Music is available to all Prime members in the US and will run on Kindle Fire HD/HDX, iOS, Android, PC, and Mac. Those who are interested in giving it a test drive can check out Amazon's 30-day free trial.

The boost to its Prime Music catalogue joins its Instant Video service, Free Two-Day Shipping, and the Kindle Owners’ Lending Library as benefits of being an Amazon Prime member.