Some tough ones in here.
A1: Porcupine Tree - Signify (Vahvahenki)
A2: Bright Eyes - I'm Wide Awake, It's Morning (Gorille85)
A3: Red Sparowes - Every Red Heart Shines Toward the Red Sun (WebRaider)
A4: Godspeed You! Black Emperor - Yanqui U.X.O. (Pols Voice)
B1: Camel - Moonmadness (Pols Voice)
B2: Henry Cow - In Praise of Learning (Pols Voice)
B3: Caravan - In the Land of Grey and Pink (Gorille85)
B4: Meshuggah - Catch Thirtythree (Fuzzboy)
C1: I.E.M. - An Escalator to Christmas (Vahvahenki)
C2: Kayo Dot - Blue Lambency Downward (Iarwain)
C3: Pink Floyd - A Saucerful of Secrets (Mladen)
C4:
D1: Van der Graaf Generator - H to He Who Am the Only One (Pols Voice)
D2: Yes - Time and a Word (Pols Voice)
D3: Radiohead - Kid A (Gorille85)
D4: Pantera - Cowboys from Hell (Mladen)