Piano Solo - Level 3 - Digital Download SKU: A0.1042887 By Gnash. By Garrett Nash and Olivia O'Brien. Arranged by Julian Callard. 20th Century,New Age,Pop. Score. 4 pages. Julian Callard #647619. Published by Julian Callard (A0.1042887). This is a solo arrangement of i hate you, i love you by Gnash and Olivia O'Brien for the piano. The full song can be listened to on YouTube.