For the ninth installment of the Performance Exhibition Series, the artists Jennifer Allora (b. 1974) and Guillermo Calzadilla (b. 1971) present Stop, Repair, Prepare: Variations on Ode to Joy for a Prepared Piano (2008). For this piece, the artists carved a hole in the center of a grand piano, through which a pianist plays the famous Fourth Movement of Beethoven’s Ninth Symphony, usually referred to as “Ode to Joy.” The performer leans over the keyboard and plays upside down and backwards, while moving with the piano across the vast atrium. The result is a structurally incomplete version of the ode—the hole in the piano renders two octaves inoperative—that fundamentally transforms both the player/instrument dynamic and the signature melody, underlining the contradictions and ambiguities of a song that has long been invoked as a symbol of humanist values and national pride.