Mention of Montana reminds me of a short quiz I was going to do. Not sure how many takers I'll get these days n ow that a lot of my regulars have switched to Facebook, but here goes.
BBC television has a quiz show called Only Connect, where teams have to find the connections between sets of clues. It;s a lateral thinking challenge, really. I have listed below four pairs of musical numbers. The two numbers in each pair are connected, and the connection is the same in each case. As with the TV show, the clues get easier as you go on. So: what connects these pairs?
So what's the connection in each case, pop-pickers?