I understand your point re: using music the B&G provide, since it seems all you are effectively doing is transferring it to another medium for them to enjoy, after having already purchased the right to listen to the music themselves.
I fear this is a short sighted attempt to skirt the copyright law that, if tested in a court, would be seen as similar to some of our industry's commercial infringement suits not long ago. When I used to deliver a chrome or print to an ad client, it was for a specific use at an agreed upon price. If they used it elsewhere, I was owed a fee. With digital, we've gotten used to granting more rights because the image is so accessible.
But the right to create another platform (video set to music) with the song is not implied in the initial sale.
In short, if contested, this is a loser.
I agree with the earlier poster, too, who said we photographers should be setting the example for ethical behavior, being subject to infringement ourselves. When they lived at home, my kids were not allowed to use Napster and the other music rip-off sites for this reason.
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jrbehm