Old Spice spokesman Terry Crews is using muscles to make music. It is true that technically anyone who makes music uses their muscles to do so but This is doing it in a slightly less than conventional way.

Muscles use electronic signals from the brain to know when to contract and relax. These high speed electric connections enable us to use our motor skills to walk, stand up, sit down and of course create music.

You can see the electric contacts attached to the Old Spice Guy's body. When he flexes one muscle or set of muscles that fires off a relay that is connected to a music making device. I don't know that this made me want to buy any deodorant but I did watch for the science of it all.