Instrumental Duet Instrumental Duet,Piano,Violin - Level 1 - Digital Download SKU: A0.933049 By Billie Eilish. By Billie Eilish O'Connell, Billie O Connell, Finneas O Connell, and Finneas O'Connell. Arranged by Antoniel Campos. Pop. Score and parts. 7 pages. Henrique Campos #6859039. Published by Henrique Campos (A0.933049). This is an arrangement for piano and violin of Billie Eilish's song Happier than ever.Both the violin part and the piano accompaniment part are written simply and are easy to play.