How do you delete music on an iPhone 3Gs without syncing?

I just recently filled up my iPhone 3Gs with music so nothing else fits on the iPhone, in other words the memory is full. I just got a new iPod 160GB and I'm listening to music on it instead of my iPhone. So is there anyway to erase all the music on my iPhone, I have it jailbroken if that helps. I just want more space for videos and apps
 
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