A free app for Android, by Roon Labs.

With Roon you can discover new music and curate your own music collection in a unique and personal way.

You can browse the entire contents of your music library in the app, or you can use the search bar to find what you’re looking for right away. Roon also has an intuitive interface that makes it easy to browse your library by genre, album, artist, or composer.

Roon can play all of your music on every compatible device. It also suggest music that will suit your taste.