Yoso is a progressive rock/soft rock supergroup combining former members of Yes (former members Billy Sherwood—bass/vocals and Tony Kaye—keyboards) and Toto (Bobby Kimball—vocals). It is a spin‑off from the group CIRCA:.

The band grew out of a plan for Kimball and CIRCA: (consisting of Sherwood, Kaye, guitarist Jimmy Haun and drummer Jay Schellen) to play together on an Italian tour in early 2009. This was cancelled, but it was decided to form a new band with all five, announced under the name AKA; this was later changed to Yoso (a combination of Yes and Toto). With Schellen busy with other projects, he was replaced by Lou Molino III, who has worked previously with Sherwood and former Yes guitarist Trevor Rabin. An album was recorded (with Schellen on some tracks and Sherwood on others) in 2009.

The band played three Mexican dates in October 2009.[1] In December, Sherwood announced the band would be moving forward with Jody Cortez on drums, and also that they had acquired Derek Shulman as their manager. Some live shows in early 2010 followed.

For touring in support of their debut release on Frontiers Records in July 2010, the band have announced a new line‑up. Joining Kimball, Sherwood and Kaye will be drummer Scott Conner (of Genesis tribute band Gabble Ratchet) and guitarist Johnny Bruhns (of Yes tribute band Roundabout).

In their live show, the band plays a mixture of Top Classic Toto songs, Top Classic Yes songs (mainly from 90125, on which Kaye performed) and new material from theor new CD, Elements.