A movement of this type whose theme is stated forwards and backward at the same time was penned by Josquin des Prez (joe-SCAN deh-PRAY), who may have tried to one-up Johannes Ockeghem (oh-kuh-GHEM) with another of these movements featuring a three-voice mensuration canon. A seventh voice is called for in the second of these movements in the otherwise six-voice (-5[1])Pope Marcellus Mass. This portion of the mass, which Renaissance composers often divided into three parts, contains the "Dona Nobis Pacem" (-5[1])(DO-nah NOH-bis PAH-chem). The phrase "who takes away the sin of the world" is repeated in this part (10[1])of the mass, which typically follows the Sanctus. This liturgical (-5[1])text is set in a choral arrangement of Samuel Barber's Adagio for Strings, whose inspiration from Virgil's Georgics shares this text's pastoral resonances. For 10 points, (10[1])name this Latin prayer (-5[1])that hails Jesus (10[5]0[3])as the "Lamb of God." ■END■