AppAgg - Application Aggregator
Spotify - Map shows when two people play same song at same time
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
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.
Fnd - Browse Apple App Store and iTunes on the Web
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm