A (most probably incomplete) list of albums on which I really enjoy only a single song (in alphabetical order, excluding one-track albums).
They turn out to be albums that I rate a 6 or 7 overall -- with few exceptions.
The songs mentioned though are all-time favourites, which I would rate at 9 or 10.
I only listed albums on which I found exactly one such song.

1.Agalloch - Pale Folklore

2.Amorphis - Far From The Sun

3.Annihilator - Set The World On Fire

4.Asphyx - The Rack

5.Bathory - Blood Fire Death

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I've been listening to Metal since 2005 and it has become my biggest passion in life.

Rarely a day goes by where I don't listen to it in one form or another. The bands I listened to in my teens inspired me to pick up the guitar (and later drums) and start making music of my own.

So here are the albums that have stood out and made the largest impact on me. To be as transparent as possible, I've labelled albums as 'nostalgia bias' where my memories of the album give it an advantage over others.

(Score is an average of each album's song ratings, full list located here. There are a ton of albums that I've rated 9/10 in the 'TBR' tab that may never make it to this list, be sure to check those out.)

If you discovered any new albums or like the same sort of metal, be sure to give this list a thumbs-up and leave a comment so more people can find these amazing bands!

My other lists:
Top 25 EPs (ordered & rated)
Top 200 Overlooked Albums (with genres)
Top 200 Overrated Albums (trigger warning)
So I Heard You Like Wintersun... (Time II find new bands)

Genre-Specific:
Top 50 Black Metal Albums
Top 50 Melodic Death Metal Albums
Top 45 Thrash Metal Albums
Top 40 Power Metal Albums
Top 30 Doom Metal Albums
Top 30 Heavy Metal Albums

1.Nine Inch Nails - The Downward Spiral

2.Opeth - Blackwater Park

3.Metallica - Master Of Puppets

4.Edge Of Sanity - Crimson

5.Opeth - Still Life

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Note: these are only for the traditional style of metal borne out of the period of late 60s - late 80s. Modern bands are permitted but they need to be playing in that style.

Recommendations are welcome. I'll listen and if I like it, I'll add it.

1.Led Zeppelin - Led Zeppelin

2.Black Sabbath - Black Sabbath

3.Black Sabbath - Paranoid

4.Deep Purple - In Rock

5.Led Zeppelin - Led Zeppelin III

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My favourite albums from legendary DIO.

1.Dio - Holy Diver

2.Dio - Dream Evil

3.Dio - Killing The Dragon

4.Dio - The Last In Line

5.Dio - Magica

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1.Celtic Frost - To Mega Therion

2.Death - Scream Bloody Gore

3.Bathory - Under The Sign Of The Black Mark

4.Slayer - Reign In Blood

5.Bathory - Blood Fire Death

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The must-have albums of old school heavy metal. Includes genres like Traditional, NWOBHM, U.S.P.M., Speed, Epic, Doom, and prog.

1.Black Sabbath - Master Of Reality

2.Black Sabbath - Sabbath Bloody Sabbath

3.Black Sabbath - Paranoid

4.Crimson Glory - Transcendence

5.Angel Witch - Angel Witch

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1.Iron Maiden - Powerslave

2.Metallica - Ride The Lightning

3.Judas Priest - Defenders Of The Faith

4.Yngwie Malmsteen - Rising Force

5.Scorpions - Love At First Sting

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1.Skeletonwitch - Beyond The Permafrost

2.Metallica - Kill 'Em All

3.Dio - The Last In Line

4.Iron Maiden - Seventh Son Of A Seventh Son

5.Iron Maiden - Iron Maiden

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1.Estatic Fear - Somnium Obmutum

2.Theatre Of Tragedy - Theatre Of Tragedy

3.My Dying Bride - Turn Loose The Swans

4.Iron Maiden - Powerslave

5.Anathema - The Silent Enigma

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The best decade in history of heavy metal.

1.Judas Priest - Painkiller

2.Iron Maiden - Somewhere In Time

3.Accept - Breaker

4.Metallica - Ride The Lightning

5.Helloween - Keeper Of The Seven Keys Part I

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1.Metallica - Ride The Lightning

2.Mercyful Fate - Don't Break The Oath

3.Celtic Frost - Morbid Tales

4.Iron Maiden - Powerslave

5.Dio - The Last In Line

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One of the best year in history of heavy metal music.

1.Metallica - Ride The Lightning

2.Judas Priest - Defenders Of The Faith

3.W.A.S.P. - W.A.S.P.

4.Iron Maiden - Powerslave

5.48 Crash - Victim Of Chains

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Albums I have downloaded and are in the process of obtaining

1.AC/DC - Back In Black

2.AC/DC - Dirty Deeds Done Dirt Cheap

3.AC/DC - High Voltage

4.AC/DC - Highway To Hell

5.AC/DC - Let There Be Rock

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These are the 211 essential hard rock/metal albums of the 80's, as were selected by the Greek Magazine "Metal Hammer" (August 2001 issue).

The albums followed by a star are the "must have", whereas the rest albums are the "could have".

1.Angel Witch - Angel Witch

2.AC/DC - Back In Black

3.Black Sabbath - Heaven And Hell

4.Diamond Head - Lightning To The Nations

5.Iron Maiden - Iron Maiden

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1.AC/DC - Highway To Hell

2.Black Sabbath - Heaven And Hell

3.Dio - Holy Diver

4.Dio - Magica

5.Dio - The Last In Line

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