Not all are Classic Rock friendly, but the list of the new additions is:

Bigelf

Delain

Eighties Matchbox B Line Disaster

Heaven’s Basement

Karnivool

Katatonia

Polar Bear Club

Soulfly

The Union

Turisas

The festival have also added a comedy stage, with the first confirmed mirth merchants being:

Jarred Christmas

Sean Hughes

Tim Minchin

Andrew O’Neill

Sonisphere takes place July 30-August 1 at Knebworth. Among the attractions are Iron Maiden, Rammstein, Alice cooper, Iggy & The Stooges, Alice In Chains and Slayer.

Find out more at www.sonispherefestivals.com

Williamson’s work has adorned album sleeves by Marillion, Fish, Judas Priest, Iron Maiden and Europe, to name but a few.

…And Marillion themselves feature on the front cover of the wallet of the new issue too.

There’s an overall arty feel to the latest issue, with Marillion, Muse, Jethro Tull and Curved Air among the bands discussing the ways in which ‘prog art’ has changed over the years.

Of course, such an issue couldn’t be discussed without input from Roger Dean and Storm Thorgerson.

And we unveil the winner of our art competition, the winner of which finds their work adorning the cover of this issue’s free CD.

We also unveil the winners of the 2009 Readers’ Poll, there’s the Critics’ Choice Albums Of the Year – and there are exclusive interviews with Todd Rundgren, Transatlantic, The Pineapple Thief, Big Big Train, Magenta, Karnivool, Ex Libras and Yak, as well as the final ever interview with the late Eric Woolfson of the Alan Parsons Project.

The new issue also carries all the details you’ll need to know about subscribing to Classic Rock Presents Prog.

Issue six of Classic Rock Presents Prog is on sale from Wednesday, January 25.

You can join Editor Jerry Ewing and writer Philip Wilding on TotalRock (www.totalrock.com) tomorrow between 12 noon and 3pm GMT, discussing the magazine and playing three hours of quality progressive rock.

Marillion feature on the front cover of the wallet of the new issue of Prog.

Inside the wallet: feast your eyes on Mark Wilkinson’s exclusive cover.