The prospect of an acoustic evening with classic rockers Jon Anderson and Rick Wakeman posed two vital questions.

First, given Rick's love of stacked electronic keyboards, exactly how acoustic would it be?

Thankfully there was not a synthesiser in sight as he took his place at the keys of a grand piano, while Jon stood alongside with just two acoustic guitars for company.

Secondly, would the instrumentally-complex Yes songs stand up to being stripped right back down to a basic acoustic format? The answer to that question is definitely in the affirmative.

If anything, Jon's voice is better these days - less helium, more control - although life on planet Anderson is as wacky as ever.

Midway through, when Jon starts to discuss pruning techniques while introducing The Garden, Rick holds his head. "We're rock and rollers, Jon," he sighs. "It's not cool to do the gardening thing."

All the same, whatever goes on in Jon's head makes for some wonderfully uplifting music.

The second half began with each man performing music from their solo work, although Jon took the stage with a new partner - Harvey, his daughters little white dog.

Rick's classical training was exemplified by Catherine Howard from his Six Wives album and in a unique arrangement of Eleanor Rigby in the style of Prokofiev, his favourite composer.

Roundabout, the first encore, was the nearest they ever got to a straightforward rock song, but it is their carefully structured, orchestral rock hybrid that marks these Yes-men out as true originals.