100Audio - 100audio has a rich library of royalty free music and free sound effect for now.
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.
AudioJungle - Discover 637399 Royalty Free Music tracks and audio files from only $1 on AudioJungle. Buy Royalty Free Music from a Global Community of Musicians and Sound Engineers.
Spotify - Map shows when two people play same song at same time
ccMixter - ccMixter is a community remix site operated by ArtisTech Media, created by Creative Commons
eSound - Your music. Without limits.