Sunn O))) have premiered a new song titled “Butch’s Guns.” This track is from the band’s new self-titled album, which will be released on April 3. In other news, the group have also announced a summer European/UK tour. Here’s the dates: 06/23 Zurich, SWI – Rote Frank 06/24 Antwerp, BEL – Trix 06/25 Amsterdam, NET…