The London quartet - who performed at last weekend's inaugural Ramblin' Man Fair - join hosts Yes, Marillion, the Neal Morse Band, Anathema, Spock's Beard and others.

Griffiths had the following to say: "It's going to be a huge honor for us to play alongside all these legendary bands, so we hope to see you there for all the proggy fun."

Morse and Mike Portnoy last week confirmed they'd be playing a tribute set to late Yes bassist Chris Squire. The cruise takes place aboard the Norwegian Pearl on the Caribbean from November 15 to 19. Watch the video - here.

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