Alt-J, the Leeds-based indie-tronica band put on this Earth to play 5:45 p.m. festival slots, have returned with a new song, “In Cold Blood,” and formal news of their next album, Relaxer. “Blood” debuted on BBC Radio 1 today, following earlier teaser single “3WW” (initially listed as “00110011 01110111 01110111,” in case you missed the Information Age theme).
On the new one, Alt-J continue to prod the…