They shouldn't be burning an entire battery's worth of power while sitting IDLE and not in the foreground though. They should be asleep, not consuming any power at all until activated once again (fast app switching).



That's exactly what I'm saying. I mentioned that I had stopped the music and stopped using the app.

The funny thing is that even when trying to use it normally it will drop the connection to the server on a whim, I wonder if it kept the connection alive al night when I wasn't actually playing anything.



Apparently not. And, without jailbreaking, there's absolutely no way you'd know if it did either. As I mentioned, recent apps are also listed in the bar and there's no way of knowing which are currently being used and consuming CPU, which as just sitting in memory dormant (fast app switching) and which are not in memory at all (simply used recently).

If your phone is jailbroken you should get a detailed process listing and check what's using CPU and memory. I'll be doing this myself later tonight when I have some time.