Chinese Mnemonics #4: 唱 (chàn:to sing)

Today's mnemonics is the one for 唱 (pronounced chàn and meaning to sing)

As you can see, the 3 squares can make you think of 3 open mouths. That's convenient because when you sing you have the mouth wide open but why 3 mouth and why 2 with tongues in the middle (you see them, right?) and 1 without?

My personal way of remembering it is to use St-Augustine's quote: "To sing is to pray twice".
So now, I have one mouth wide open on the left that is for "to sing" and two mouths with tongue on the right that come closer to talk twice and in our case "to pray twice"