Guitar,Piano,Vocal,Voice - Level 1 - Digital Download SKU: A0.818443 By Shawn Mendes. By Scott Friedman, Scott Harris, Shawn Mendes, and Teddy Geiger. Arranged by Aki Saito. Pop. Score. 5 pages. Aki Saito #5222447. Published by Aki Saito (A0.818443). Easy Piano Solo TREAT YOU BETTER by Shawn Mendes in key of Am arranged by Aki Saito.Perfect for late beginners. Good arrangement for someone who wants to enforce the 8 beat rhythm. Some parts require a fast finger/hands movement like percussions in order to sound authentic.