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Ordinary Brainwash: Disorder In My Head
Stil: Prog/Alternative/Art Rock (Punkte: 11/15)
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Ordnance: Rock City
Stil: Power / Thrash Metal
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Ordnance: Struggle
Stil: Groove Metal
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Ordo Infernus: Invictus Et Aeternus
Stil: Death Metal (Punkte: 10/15)
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Ordo Obsidium: Orbis Tertius
Stil: Black Metal / Funeral Doom (Punkte: 11/15)
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Oregon: 1974
Stil: Jazz, Weltmusik, Fusion
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Oregon: Always, Never, And Forever (1992) – Vinyl-Remaster
Stil: Jazz Rock, Fusion
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Oregon & Tchaikovsky Symphony Orchestra: Oregon In Moscow
Stil: Klassik und Jazz
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Oreyeon: Ode To Oblivion
Stil: Stoner Rock (Punkte: 10/15)
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Organic: Where Graves Abound
Stil: Death Metal (Punkte: 11/15)