Malcolm in the Middle season 6 episode 7
Episode title: Hal Sleepwalks
Hal is sleepless because of their upcoming 20th wedding anniversary. So he ask Reese for some ideas for presents. Then Reese gets the idea to brainwash his dad while he's nervous. Dewey's friends are set up in an upcoming student body election when a bully nominated two of his geeky friends. Malcolm takes up playing the electric guitar, though Lois discourages his musical ability. He writes a heart warming song. When he plays & sings his creation, Dewey figures out that his song is sung to the tune of the "Meow Mix" jingle!
