It might be a musical stretch to even think of the British rock-pop band Queen and U.S. folk-rock singer John Sebastian in the same thought bubble. But it’s really an ironic numbers thing about them both that just came to mind. As Sebastian once sang in a Lovin’ Spoonful song, “there’s thirteen-hundred and fifty-two guitar pickers in Nashville.” And, of course, there aren’t that many Queen tribute bands in the world.