There are two artists with this name:

1 Atmospheric sludge/post-meta from Lausanne, Switzerland

Bandcamp

2. Orso is an experimental outlet led by Rex's Phil Spirito, Red Red Meat's Brian Deck, and Ben Massarella, featuring banjo-centered tunes fleshed out with non-traditional instruments, such as typewriters and toilets. Orso's self-titled debut album was released 1999, with Tim Rutili and Bundy K. Brown making guest appearances. Long Time By, a much more focused effort, followed in 2000. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.