Sorry if this isn't in the "bugs" section but for some reason it wont let me post there, so I thought you should know:
There is a pretty annoying but on iOS that doesn't let you set a timer to stop music. The built-in timer of iOS (iPhone in my case) seems to perfectly stop any app that plays music, all but spotify. As an app that is all about music and making it so comfortable for the user, I don't see why this is prolonging in many version that i've waited for to be have it fixed.
I'm currently using iPhone 5, with the latest iOS version 7.1.1 and with the latest version of Spotify. (not sure what number it is, but the app store doesnt show any updates for it).