Choral Choir (Unison) - Level 1 - Digital Download SKU: A0.881200 Composed by Burgundian Carol. Arranged by arr. Denise M. Owen. Christmas,Instructional,Standards,World. Octavo. 3 pages. Denise M. Owen #3386099. Published by Denise M. Owen (A0.881200). An arrangement of the Christmas carol Pat-a-pan for unison voices and piano, for children's choirs or school programs grades 1-6. The vocal part is the straightforward traditional Christmas carol, with the accompaniment imitating the drum in the left hand and with each verse becoming more complex in the right hand.