Mary decides to buy a piano, even though Lester hates the idea and Brenda doesn't want to take lessons. When Sandra & Rose visit to take a look at the piano, Rose offers Mary piano lessons and Sandra wants lessons as well. Then, Sandra makes a sucker bet that for $20, she'll progress faster than her. After many piano lessons, Mary still struggles. Pearl tells Mary that Sandra used to take piano lessons. During a lesson, Mary offers to throw a party recital to show their progression. She shocks Sandra when she plays ""Minuet in G."" (thetvdb.com)