|  | Frank Zappa |  | The Best of Frank Zappa (2004) [Compilation] |  |  | Experimental Rock, Jazz-Rock, Comedy Rock, Progressive Rock | - | 0 | 
|  | Circle Takes the Square |  | As the Roots Undo (2004) |  |  | Screamo, Progressive Rock | - | 0 | 
|  | Angra |  | 5th Album Demos (2004) [Demo] |  |  | Progressive Metal, Power Metal | - | 0 | 
|  | Premiata Forneria Marconi |  | Piazza del campo (2004) [Live] |  |  | Progressive Rock | - | 0 | 
|  | Roger Waters |  | To Kill the Child / Leaving Beirut (2004) [Single] |  |  | Art Rock, Progressive Rock | - | 0 | 
|  | Focus |  | Masters From the Vaults (2004) [Compilation] |  |  | Progressive Rock, Hard Rock | - | 0 | 
|  | Strawbs |  | Full Bloom: Live at Natural Sound (2004) [Live] |  |  | Progressive Rock, Folk Rock, Progressive Folk | - | 0 | 
|  | Big Big Train |  | Gathering Speed (2004) |  |  | Progressive Rock, Symphonic Prog, Neo-Prog | - | 0 | 
|  | Leprous |  | Silent Waters (2004) [Demo] |  |  | Progressive Metal | - | 0 | 
|  | Ozric Tentacles |  | Curious Corn / Swirly Termination (2004) [Compilation] |  |  | Space Rock, Progressive Rock | - | 0 | 
|  | Rick Wakeman |  | Revisited (2004) [Live] |  |  | Progressive Rock, Symphonic Prog | - | 0 | 
|  | Wuthering Heights |  | Far From the Madding Crowd (2004) |  |  | Progressive Metal, Power Metal, Folk Metal | - | 0 | 
|  | Porcupine Tree |  | Warszawa (2004) [Live] |  |  | Progressive Rock, Psychedelic Rock | - | 0 | 
|  | Magnitude 9 |  | Decoding The Soul (2004) |  |  | Progressive Metal | - | 0 | 
|  | Kylesa |  | No Ending / a 110° Heat Index (2004) [EP] |  |  | Progressive Sludge Metal, Psychedelic Sludge Metal | - | 0 | 
|  | Dreamscape |  | End Of Silence (2004) |  |  | Progressive Metal | - | 0 | 
|  | Manigance |  | D'un Autre Sang (2004) |  |  | Power Metal, Progressive Metal | - | 0 | 
|  | Threshold |  | Critical Energy (2004) [Live] |  |  | Progressive Metal | - | 0 | 
|  | Vitalij Kuprij |  | Forward And Beyond (2004) |  |  | Progressive Metal, Neo-classical Metal | - | 0 | 
|  | Renaissance |  | Innocents & Illusions (2004) [Compilation] |  |  | Symphonic Prog, Progressive Folk, Progressive Rock | - | 0 | 
|  | Time Requiem |  | Unleashed In Japan (2004) [Live] |  |  | Neo-Classical Metal, Progressive Metal | - | 0 | 
|  | Orphaned Land |  | Mabool - The Story of the Three Sons of Seven (2004) |  |  | Progressive Metal, Folk Metal, Death Metal | - | 0 | 
|  | Pain Of Salvation |  | 12:5 (2004) [Live] |  |  | Progressive Metal | - | 0 | 
|  | The Pineapple Thief |  | Variations on a Dream (2004) |  |  | Progressive Rock, Alternative Rock | - | 0 | 
|  | The Decemberists |  | The Tain (2004) [EP] |  |  | Progressive Rock, Indie Rock, Folk Rock, Baroque Pop | - | 0 | 
|  | Ozric Tentacles |  | Spirals in Hyperspace (2004) |  |  | Space Rock, Jam Band, Progressive Rock, Psychedelic Rock, Electronic | - | 0 | 
|  | Time Requiem |  | The Inner Circle Of Reality (2004) |  |  | Neo-Classical Metal, Progressive Metal | 80 | 1 | 
|  | Focus |  | Live at the BBC (2004) [Live] |  |  | Progressive Rock | - | 0 | 
|  | Spastic Ink |  | Ink Compatible (2004) |  |  | Progressive Metal | - | 0 | 
|  | Disillusion |  | Back to Times Of Splendor (2004) |  |  | Melodic Death Metal, Progressive Metal | - | 0 |