Question: Which band Birthmark or Alt-J was formed first ?
Sentence (from "Alt-J"): Alt-J, stylised as alt-J, are an English indie rock band formed in 2007 in Leeds, by Gwil Sainsbury (guitar/bass), Joe Newman (guitar/lead vocals), Thom Sonny Green (drums) and Gus Unger-Hamilton (keyboards/vocals).
Relevant evidence: Yes