Piano,Violin - Level 3 - Digital Download SKU: A0.1227885 By Sia. By Christopher Braide and Sia. Arranged by Anya Alston. Pop,Singer/Songwriter. 10 pages. Anya Alston #823883. Published by Anya Alston (A0.1227885). Unstoppable by Sia arranged for solo violin with piano accompaniment, PDF includes full score and individual parts.