kendall: a classical harp (the huge ones with the straight pillars that you see in orchestras) have seven pedals around the base. each pedal corresponds to a note (a, b, c, edc.). when you push the f pedal into the lower position, all the f's are sharped; in the upper position, all the f's are flatted; in the middle position, all the f's are natural. this way you can change keys or play accidentals without using your hands to flip a lever.

groucho said that, eh? then there must be a punchline. i find it pretty unlikely when taken as a serious statement on harpo's limitations.