The Requiem, for mixed chorus (4 and 8 parts), two brass quartets (2 trumpets, horn and trombone each), timpani (4) and organ, is divided into four sections or movements: I. Introit and Kyrie II. Sanctus III. Pie Jesu IV. "Take Thou Comfort". The principal feature of the Requiem is the cyclic treatment of the two main themes. These will be referred to as the "Introit" theme and the "Kyrie" theme, in that these are the sections in which they first appear, respectively.