Mercy SA/men Acc - Choir Rocks! Author:Duffy "Choir Rocks!" is an exciting new choral series from Faber Music providing fantastic arrangements of contemporary classics. Under the guidance of general editor Ben Parry, all the arrangements have been flexibly written for soprano, alto and optional men, with piano accompaniment. "Mercy" was Duffy's second single from her debut album "Rockferry... more »". Released in February 2008 to critical acclaim and unprecedented chart success, it was also Duffy's first international release.« less