I suspect that a lot of these will be easy for many here, seeing as some of them are pretty common around here.
It's not ONLY studio-albums, there might be one or two that is some form of other album, but I don't think it will be that hard.
Also, I'll post hints later on if people get stuck.
Up to down = A to E, left to right = 1 to 5.
A:
1. Oceansize - Everyone Into Position (Wolfking)
2. Opeth - Watershed (YtseJamittaja)
3. Porcupine Tree - We Lost the Skyline (YtseJamittaja)
4. Anathema - A Natural Disaster (Liberation)
5. Thrice - Vheissu (Kosmo)
B:
1. Pendulum - Hold Your Colour (Kosmo)
2. Radiohead - Amnesiac (Mladen)
3. Tori Amos - Scarlet's Walk (Pols Voice)
4. Ulver - Kveldssanger (Iarwain)
5. Björk - Volta (Gorille85)
C:
1. The Dear Hunter - The Color Spectrum (Kosmo)
2. 65daysofstatic - We Were Exploding Anyway (kári)
3. Amplifier - The Octopus (Wolfking)
4. The River Empires - Epilogue (Fuzzboy)
5. Petter Carlsen - Clocks Don't Count (Liberation)
D:
1. The Tallest Man on Earth - Shallow Grave (Gorille85)
2. Between the Buried and Me - Colors (Kosmo)
3. Riverside - Anno Domini High Defenition (YtseJamittaja)
4. Sigur Rós - ( ) (kári)
5. The Pineapple Thief - Tightly Unwound (Gorille85)
E:
1. Mogwai - Young Team (Iarwain)
2. No-Man - Together We're Stranger (LieLowTheWantedMan)
3. Pure Reason Revolution - The Dark Third (YtseJamittaja)
4. Alcest - Ecailles De Lune (Iarwain)
5. Emilie Simon - Vegetal (Iarwain)