A fifteen year old kid gets an upright bass and starts to take lessons.
After his first lesson, his dad asks him, “what did you learn today?” “I learned to play the A note.”
After his second lesson his dad asks again, and he responds “I learned to play the D note.”
After his third lesson his dad asks again and he responds, “I learned to play the E note.”
After the fourth lesson his dad asks, and the kid responds, “I don’t need lessons anymore. I’ve got a gig with a bluegrass band