So like albums that have a clear tie between them, were recorded around about the same time and were clearly intended together, as opposed to a sequel coming years after. Some of these have actually been released together, as can be seen here.

That's about all I can think of right now. So feel free to think of some more for me.

Created by:

RaduP | 23.03.2019

	1.	Opeth - Deliverance
	2.	Opeth - Damnation
	3.	Metallica - Load
	4.	Metallica - Re-Load
	5.	Helloween - Keeper Of The Seven Keys Part I
	6.	Helloween - Keeper Of The Seven Keys Part II
	7.	Moonspell - Alpha Noir / Omega White
	8.	System Of A Down - Mezmerize
	9.	System Of A Down - Hypnotize
	10.	Bathory - Nordland I
	11.	Bathory - Nordland II
	12.	Swallow The Sun - Songs From The North I, II & III
	13.	Ayreon - The Universal Migrator Part I: The Dream Sequencer
	14.	Ayreon - The Universal Migrator Part II: Flight Of The Migrator
	15.	Avantasia - The Metal Opera Part I
	16.	Avantasia - The Metal Opera Part II
	17.	Beardfish - Sleeping In Traffic: Part One
	18.	Beardfish - Sleeping In Traffic: Part Two
	19.	Devin Townsend - Z²
	20.	Pain Of Salvation - Road Salt One
	21.	Pain Of Salvation - Road Salt Two
	22.	Between The Buried And Me - Automata I
	23.	Between The Buried And Me - Automata II
	24.	Five Finger Death Punch - The Wrong Side Of Heaven And The Righteous Side Of Hell - Volume 1
	25.	Five Finger Death Punch - The Wrong Side Of Heaven And The Righteous Side Of Hell - Volume 2
	26.	Blut Aus Nord - 777 - Sect(s)
	27.	Blut Aus Nord - 777 - The Desanctification
	28.	Blut Aus Nord - 777 - Cosmosophy
	29.	The Ocean - Heliocentric
	30.	The Ocean - Anthropocentric
	31.	Virgin Black - Requiem - Mezzo Forte
	32.	Virgin Black - Requiem - Fortissimo
	33.	Virgin Black - Requiem - Pianissimo
	34.	Demon Hunter - War
	35.	Demon Hunter - Peace
	36.	Sunn O))) - White1
	37.	Sunn O))) - White2
	38.	Periphery - Juggernaut: Alpha & Omega
	39.	Xanthochroid - Of Erthe And Axen: Act I
	40.	Xanthochroid - Of Erthe And Axen: Act II
	41.	Violet Cold - Sommermorgen (Pt. I) - Innocence
	42.	Violet Cold - Sommermorgen (Pt. II) - Joy
	43.	Violet Cold - Sommermorgen (Pt. III) - Nostalgia
	44.	Virgin Steele - The Marriage Of Heaven And Hell Part I
	45.	Virgin Steele - The Marriage Of Heaven And Hell Part II
	46.	Guns N' Roses - Use Your Illusion I
	47.	Guns N' Roses - Use Your Illusion II
	48.	Satan's Host - Pre-Dating God Part 1
	49.	Satan's Host - Pre-Dating God Part 2
	50.	Benighted In Sodom - In Hora Maledictus - Part I
	51.	Benighted In Sodom - In Hora Maledictus - Part II
	52.	Nachtmystium - Assassins: Black Meddle, Part 1
	53.	Nachtmystium - Addicts: Black Meddle, Part 2
	54.	Exodus - The Atrocity Exhibition: Exhibit A
	55.	Exodus - Exhibit B: The Human Condition
	56.	Solefald - Red For Fire : An Icelandic Odyssey Part I
	57.	Solefald - Black For Death: An Icelandic Odyssey Part II
	58.	Stratovarius - Elements Part I
	59.	Stratovarius - Elements Part II
	60.	Virgin Steele - The House Of Atreus Act I
	61.	Virgin Steele - The House Of Atreus Act II
	62.	Vanden Plas - Chronicles Of The Immortals: Netherworld (Path 1)
	63.	Vanden Plas - Chronicles Of The Immortals: Netherworld II
	64.	Rebellion - Sagas Of Iceland: The History Of The Vikings Volume I
	65.	Rebellion - Miklagard: The History Of The Vikings Volume II
	66.	Rebellion - Arise: From Ginnungagap To Ragnarök - The History Of The Vikings Volume III
	67.	Iced Earth - Framing Armageddon (Something Wicked - Part 1)
	68.	Iced Earth - The Crucible Of Man (Something Wicked - Part 2)
	69.	Therion - Leviathan
	70.	Therion - Leviathan II
	71.	Therion - Leviathan III
	72.	Árstíðir Lífsins - Saga Á Tveim Tungum I: Vápn Ok Viðr
	73.	Árstíðir Lífsins - Saga Á Tveim Tungum II: Eigi Fjǫll Né Firðir
	74.	Ulthar - Helionomicon
	75.	Ulthar - Anthronomicon
	76.	Lords Of Black - Alchemy Of Souls - Part 1
	77.	Lords Of Black - Alchemy Of Souls - Part 2
	78.	Royal Hunt - Dystopia
	79.	Royal Hunt - Dystopia – Part II
	80.	The Acacia Strain - Step Into The Light
	81.	The Acacia Strain - Failure Will Follow
	82.	Wintersun - Time I
	83.	Wintersun - Time II
	84.	Amiensus - Reclamation: Part 1
	85.	Amiensus - Reclamation: Part 2