One thing that I think makes playlists enjoyable with Spotify is that anyone can make one and share it with others so that they can play the same songs in their app.
Like most apps with free music, Spotify lets you add your favorite songs to your music library and play those songs again later. It lets you find music by viewing top lists and new releases, as well as by searching for playlists and your favorite artists and albums. This is my go-to music app when I want to find music similar to the stuff I know I already like. Spotify is an awesome music app that lets you follow artists and sync music from your desktop. Like Pandora, listed below, you can create a radio station so it plays recommended music based on your initial interest.