The move is an attempt to attract users in a field that has seen tough competition from the likes of Sweden's Spotify and Rhapsody in the U.S.
Subscription music services are gaining in popularity. For $10 a month, they allow users to stream an unlimited amount of songs on mobile devices. Users can select from millions of tracks, including those off the latest albums.
But some prominent artists like Adele and Coldplay have kept their newest work off the services because of fears of hurting album sales.