Mercy Arms were an Indie rock band from Sydney, Australia. Formed in early 2005, the four-piece was composed of Thom Moore (lead vocals, guitar), Kirin J. Callinan (guitar), Ash Moss (bass guitar) and Julian Sudek (drums, percussion). The band formed when Moore met Callinan and Sudek. Callinan and Sudek lived in the same area and were childhood friends. Bassist Ash Moss joined the band soon after. The band played their first show in April 2005, days after their first rehearsal.