On Sing Along depending on have many colored numbers a player has made, the game has a certain distinct melody when a player lands the ball in the holes and the game starts jumping holes and counting points.
I like the way King of Diamonds sounds to me when I am playing it. Spin a Card and Flip a Card sounds different with all the spin relays clicking etc.
Don't rush when you get to the sound rating section and put in some time to listen to your EM's closely. You will be surprised to learn how each one has its own unique way of sounding off, especially if a player gets a real good game and makes special and starts popping like crazy. The knocker has always been one of my best sounds to hear on an EM.