There are at least 2 bands sharing the name "Defeater": 1. Melodic-hardcore band from Boston, Massachusetts, USA 2. Heavy/speed metal band from Chile 1) Defeater are an American melodic-hardcore band from Boston, Massachusetts. To date, they have released Three full-length albums, two EPs and a single. The band's current lineup consists of Derek Archambault (vocals/acoustic guitar), Jay Maas (guitar), Jake Woodruff (guitar), Joe Longobardi (drums) and Mike Poulin (bass).