This is a great option for listening to streaming radio, with an intuitive interface that makes it easy to find what you want quickly. To use Slacker you must sign up for an account or log in with your Facebook credentials.
You can search for artists using a field at the top; check out the Music Guide curated by Slacker; or search by genres, stations you've previously listened to, specialty stations, or news, talk, and sports stations. Each selection on the first screen leads to another list where you can swipe to browse selections to find the stations, genres, and music you want to listen to.
Slacker Radio is a solid choice for streaming music with an enormous music library, and even with just the free app, you can create and listen to radio stations of your favorite genres of music.