While we visiting with Andrew, Erica kept bugging him to play "the Cow song" for me. Eventually, Andrew asked Mike if he could borrow a guitar and played and sang "Keeping Watch Over Some Cow" for us. It's a classical guitar piece from 16th-century Spain, Guardame Las Vacas, with Andrew's original lyrics. (And it sticks in your freaking head -- I've been singing it for days.) Mike made him play it a couple more times, and now Andrew is playing it in the show.