Jon Davison, who also fronts Yes, has laid down vocal tracks alongside returned live singer Carl Groves and former member Susie Bogdanowicz. Guest musician include Rob Reed of Magenta, David Ragsdale of Kansas and Randy Jackson of Zebra.

And the album marks Glass Hammer's first-ever collaboration with an outside lyricist in the track Crowbone, penned by British historical fiction novelist Robert Low.

Babb tells Prog: "We turned a corner last year when Carl rejoined to fill in for Jon, who was touring with what we call 'the other band.' We knew it wasn't a good thing to have Carl only front us on stage, but we'd always said how much we would love to have him in the studio, as well as Susie � so, back she came as well In our minds, they'd never really left.

"Jon hasn't quit just because he's working with Yes, so Ode To Echo features all three of these singers, and even a couple of others from years gone by."