A bloke asks his wife if he can have bass lessons for their 25th wedding anniversary. She agrees, so off he goes to his first lesson. He comes back, gets out the bass and points at the bottom string. "Apparently," he say, "this string is called E". He puts the bass away. The following week he comes back from his next bass lesson, gets ou the bass and points at the next string up "Apparently," he says "this string is called A" and then puts the bass away. The following day he's leaving the house with the bass on his back, when he wife "You haven't got a lesson today, have you?"
"No," he says "I've got a gig!"