Pandora is really good if you want to listen to music and related music. Sometimes it will play a random song that has nothing to with the station but i guess that depends on which songs you like on the app.
I used this before I got my fitbit to keep track of what I was eatiNg throghout the day. It's a really great app. Keeps everything organized and simple. You can search foods or make your own. You don't realize how many calories you eat until you start keeping track of them which this can help you with.