Hi, Dan! :)
I can tell you that we spent $600 to license 2 tunes for our show this year (a TV show's theme and a Beatles number). Our ballad, however, was a pop song from the last 6 years or so and was going to cost us $1,100 just for that number.
Needless to say, we got a new ballad.
As has been said, though, sync rights (setting any protected music content to *any* visual element, be it live images, edited video, or still photos) are a completely different animal from licensing rights, and the syncing rights are absolutely bananas expensive.
Reynoldsburg HS got popped several years back for posting a video on YouTube of the band performing their show, which had licensed songs in it. It got very ugly for the district very quickly.