Arista listened to all four and wanted all of them, but Rabin would not agree to the request. The "Yes-West" group were working on a follow-up to Big Generator and had been shopping around for a new singer, including Roger Hodgson of Supertramp, Steve Walsh of Kansas, Robbie Nevil of "C'est la Vie" fame, and Billy Sherwood of World Trade. Walsh only spent one day with them, but Sherwood and the band worked well enough together and continued with writing sessions. Arista suggested that the "Yes-West" group, with Anderson on vocals, record the four songs to add to the new album which would then be released under the Yes name.
Union was released in April 1991 and is the thirteenth studio album from Yes. Each group played their own songs, with Anderson singing on all tracks. Squire sang background vocals on a few of the ABWH tracks, with Tony Levin playing all the bass on those songs. The album does not feature all eight members playing at once. The track "Masquerade" earned Yes a Grammy Award nomination for Best Rock Instrumental Performance in 1992. Union sold approximately 1.5 million copies worldwide, and peaked at number 7 in the UK and number 15 in the US charts. Two singles from the album were released. "Lift Me Up" topped the Mainstream Rock charts in May 1991 for six weeks, while "Saving My Heart" peaked at number 9.
Almost the entire band have openly stated their dislike of Union. Bruford has disowned the album entirely, and Wakeman was reportedly unable to recognise any of his keyboard work in the final edit and threw his copy of the album out of his limousine. He has since referred to the album as "Onion" because it makes him cry when he thinks about it. Union Co-producer Jonathan Elias later stated publicly in an interview that Anderson, as the associate producer, knew of the session musicians' involvement.