Play It Again, Charlie Brown (1971)

In order to win the ever resistant Schroeder's affections, Lucy follows Peppermint Patty's advise and talks him into performing for a PTA meeting. Unfortunately, Patty, in her usual level of sensitivity, fails to mention until after Schroeder's agreement that only rock music will be on the program. Now Lucy, knowing that Schroeder would never agree to that, must find a solution.