All of a sudden my iMac has started showing a popup notification in the middle of the screen every time a song changes. I'm not sure what's changed. But I don't want them.
I checked iTunes's preferences and didn't see anything, though admittedly I often overlook things. I thought maybe it was Growl which I installed years ago, but it doesn't look like it as it wasn't running and wasn't configured for iTunes notifications anyways.
Where are these popup notifications coming from, and how can I get rid of them?