How to download music for my iPhone 4?

I want to put music on my iphone 4 through my computer since this certain song is not available through iTunes. I used uTorrent and put it into my itunes library and added the song to my iPhone 4 and it sounded all weird and glitchy. What can I do?

Stop cooking meth Walt

If it plays fine on your computer, it should play fine on the iPhone. IPhone take any mp3 music the same way. Try downloading it again if you have to. If you synced your iPhone, try using manual management instead