A movement in this musical form titled “Quaerendo invenietis” ("kway-REN-doh in-veh-nee-AY-tiss”) instructs a performer to turn their music upside down as if using a mirror. In a piece in this form, the violins play dux ("DOOKS”) and comes ("COH-mez”) parts over an ostinato beginning (-5[1])(read slowly) “D, down to A, up to B, down to F-sharp.” Every third movement except the last of J. S. Bach’s Goldberg Variations is in this form, whose “crab” type uses (10[1])a (10[1])retrograde voice. A gigue (10[1])("ZHEEG”) is paired with (10[1])a piece in this form that features a bassline that is repeated 28 times. A round is a type of this form in which the same melody is sung at different (10[1])times. For 10 points, name (10[1])this musical form of a widely performed (10[2])Johannes Pachelbel piece “in D.” ■END■