Gamma Knife (or Gamma Knife/Grey Dream) is the fifth album by avant-garde metal group Kayo Dot. The album was self-released independently through Driver's Ice Level Records via Bandcamp on January 4, 2012 after a crowdfunding project via Kickstarter and leaving Hydra Head Records. It was recorded live mostly at Brooklyn, New York venue Littlefield on October 5, 2011 despite also being partially recorded at frontman Toby Driver's residence in late 2011. It was mixed and mastered by longtime producer Randall Dunn, notable for producing numerous Sunn O))) albums. It is notable for beginning the return to Driver's metal roots and features growled and screaming vocals for the first time since Choirs of the Eye. SputnikMusic gave the album a 3.5/5, stating that "for the first time in years, Kayo