Can't delete song from iPhone?

I downloaded a song on itunes and then synced it with my iphone. However, my iphone synced two versions of the track, one of which is completely defunct (does not play) and has no album artwork. I was able to easily delete the other one using swipe>delete. But this one won't go away. How can I easily get rid of it?

You didn't know that once you put something on your iPhone, iPad, iPod you can't take it off? Why do you think so many people buy whatever new model comes out every year?

Delete it off the iPhone, then delete it off the computer. Then sync it