This app has playlists based on your music collection. It's terrible. Just because I listened to some grunge, Apparently that means I must love nirvana, pearl jam, the Beatles or whatever was popular in the 90's. Sorry but no. If I wanted to listen to that, I'd have it in my collection. As for the Data usage, it's terrible. Apparently we must have a music video with ever song. No thanks. I'm here to listen, not watch. Fortunately they have the ability to turn it off in the settings. This stinks