On this episode, Ethan plays music that requires knocking on the piano. First, he plays the historically important Carolina Fox Trot, which has some clapping and knocking, and was actually the first published Fox Trot ever. Then, Ethan plays an original composition called the "Whack-a-Mole Rag" in which he tries to whack pesky musical moles. Finally, soprano Melinda Whittington pops in, gives Ethan some hair-care advice, and sings "Knock Wood" with a little percussion solo.