... when you talk to your 4 year old's preschool/daycare teacher at pickup time and she says that recently, your son has been sitting on a plastic boat in the sandpit singing C2, D2, B, A etc during outside play time and she wants to know what he means by it. And when you talk to the child about it, he says that he just wanted to sing "Row, Row, Row your boat" using piano notes instead of lyrics because he was too bored of singing to himself in the "usual" way!