On their first album
(only album, perhaps) in 1989
they were assisted by Tony Levin
on bass, who also tour
ed with them, along with an extra keyboardist
and guitar player
ABWH were making a second album, when the rest of Yes (then Trevor Rabin, Chris Squire, Tony Kaye, and Alan White) asked Jon Anderson to sing a few songs. The end result was the horribly mishmashed Union in 1991, with a mix of stuff destined for the second ABWH album, a new Yes album, and a supporting cast of thousands that the producers brought in in a desparate attempt to make the album a cohesive whole. While it has its moments, and I surely liked it at the time, I haven't listened to it in years.
The album Anderson, Bruford, Wakeman, and Howe (and yes, it does sound like the name of a law firm) was in the top ten albums listed in the book The 50 Worst Rock and Roll Albums of all time, but it was clear the writers had a thorn in their paw about progressive rock so it's not surprising. ABWH has some good stuff on it. No, it's not a prog rock masterpiece, but there's at least 50 rock albums worse than it. And it was good enough for The Dead Milkmen to parody in their song Anderson, Walkman, Buttholes and How