Courtis' work includes over one hundred albums published by labels from Japan, Europe, USA, and Latin America. He has toured worldwide and collaborated with artists Lee Ranaldo (Sonic Youth), Yoshimi & Yamamoto (Boredoms), Damo Suzuki (Can), KK Null, Eddie Prevost (AMM), Rick Bishop (Sun City Girls), Pauline Oliveros, Kawabata Makoto (Acid Mothers Temple), Masonna, Mats Gustafsson, Tom Carter (Charalambides), Avarus, Toshimaru Nakamura, Tetuzi Akiyama,Rudolf Eb.Er, Kouhei, Astro (CCCC), Nihilist Spasm Band and Lasse Marhaug, among others.

Here are some reviews on Courtis' music:

"Guitarist Anla Courtis has produced an incredible melange of guitar, Toba violin and tape music. The sounds roll on like ducks down a cement mountain. Squeedles of upper register amp noise curl along the edge of clouds on one side, the other is more low-down - like elephants on the killing floor. It's a really great record, and probably the manifestation of a new sort of guitar sound."
- Bryon Colley. THE WIRE, UK.

"The mighty glacial drone returns. Courtis leaves it all on the table. Using his guitar as the main weapon, he settles in to making some of the most hypnotic and beautiful music I've heard in some time. This is brilliant. Absolutely stunning."
- 9/10, FOXY DIGITALIS, USA.