As rumored, Spotify today unveiled a redesigned app that's geared toward users of its free music-streaming service at an event in New York City. The new mobile experience is all about personalized on-demand listening, with 15 playlists that are curated by Spotify based on your listening habits. That includes sets like the Daily Mix, which feature songs you've "hearted" (aka liked) and Discover Weekly, which is designed to help you expand your music taste with artists and tracks you may not be too familiar with. The Release Radar playlist, meanwhile, will let you keep up with all the new music popping up on the service. Spotify says that the more songs you "heart" or "hide," the smarter its playlists will get and others will begin to populate as a result.