On my iPhone 5 running Beta 3 I found the music playback controls on the lock screen and in Control Center do not work. The previous track, play (Or pause), and next track buttons all do not work no matter if I hold down the button, tap it once or multiple times, when the music app or any other apps with music are playing or not. I also found another bug where I was playing a song through the music app. In the lock screen the top volume slider said my volume was lets say 80% (On speaker while doing some cleaning around the house). I slid up control center and it said my volume was at 0%. If I adjusted the sliders in any way the music would go to their respective levels. The music app seemed to be directly linked to the volume slider under the clock. It is a little annoying to have to open the music app when I want to play a song, or do any controls like next/previous track or pause it.