IPhone 4 doesn't have enough room for IOS 7?

I've downloaded it and everything but it says I need 624 MB of space but I only have 234. I deleted all my apps but 2, have only around 100 pictures, and don't have a lot of music. There isn't anything else to delete to make room for this update. What do I do?

Added (1). There's nothing on iCloud taking up room there. The biggest thing taking up room is music with 461 MB but I don't want to delete my songs. I don't want to reset and lose everything.

Reset it back to factory defaults then install IOS. Something on there's taking up your memory.

A) Get a new iPhone
B) Get an Android so you can experience a wonderful thing called external storage
C) Stay with your current OS