A father sends his son to music lessons. The kid gets home and the dad asks: So, what'd you learn at music school today? Kid answers: Bass guitar! Today I learned the E string. Dad replies: That's great son, go upstairs and practice. Next day the kid comes home, Dad asks...So, what'd you learn today? Kid replies...the A string, Dad. That's good son, go and practice. Next day, same thing...Kid comes in, Dad asks: What'd you learn today? Kid answers: Oh, I couldn't go. I had a gig.