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A father was buying bass lessons for his son.
The 1st week the father asked him what he had learned
The son said "On my 1st lesson we learned about the E string"
The 2nd week came and after the lesson the father asked what had he learned that week
The son said "On my 2nd lesson I learned about the A string"
3rd week came by and the father said to his son "You know these are expensive lessons what have you learned this week"
The son said "I quit the lessons I already got a gig"

You should get an earful for that joke.