Piano,Vocal,Voice - Level 3 - Digital Download SKU: A0.948034 By Sia. By Greg Kurstin and Sia. Arranged by Marcia L McKenna. Pop. Score. 5 pages. Marcia L. McKenna #6660039. Published by Marcia L. McKenna (A0.948034). This is a unique and upbeat Christmas song written by Sia Furler and Greg Kurstin.  This piano/vocal/guitar arrangement is fun to play because of the syncopated rhythms and quick triplet octaves in the left hand.  The left hand melody in the middle section accompanied by repetitive chords in the right hand adds a nice contrast and another challenge for piano students.