Just what are the plots of concept albums?

Pretty much every goregrind band: "I am the man who threw the bitch into the over-sized meat grinder and jacked off as she was turned into giblets."

Or something to that effect.

Blind Guardian - Nightfall in Middle Earth: Simarillion, elves, dragons, jewelry and some other shit.

Cannibal Corpse's whole discography: how to kill somebody, be a zombie and other fun things.

 

No, seriously though, Metallica actually have a concept album. It's the collaboration with Lou Redd, Lulu. And the story is:

 

The collaboration was originally intended to be Metallica re-recording various previously unreleased tracks Reed had written over the years.^[5] Among these unreleased demos was a collection of songs composed for a play called Lulu�a theatrical production of two plays originally written by the German playwright Frank Wedekind.^[6] Reed shared the demos of these songs with the members of Metallica to help bring the "piece to the next level,"^[7] and the group provided "significant arrangement contributions" to the material

 

from wikipedia

 

Grave Digger - Excalibur: Tells the story of King Arthur and The Knights of Round Table.

 

Dark Avenger - Tales of Avalon, The Terror: Tells the story of King Arthur and The Knights of Round Table.

 

It�s been a while so I might get some of the details wrong. Please don�t hesitate to correct me.

 

A man (Jonathan) and his young bride (Miriam) arrive at the mansion that he has inherited to start their life together there. Before entering the house they are warned by seven dark horsemen who used to work for the man�s ancestors that the house is possessed and that they shouldn�t enter. Jonahtan laughs at their warnings but the first night at the house Miriam is haunted by the family ghost, who tells her the horrifying story of Jonathan�s ancestors. A tale of infidelity, murder and a stillborn bastard child (Abigail) who becomes a monster. Soon after Miriam is possesed by Abigail and appears pregnant. Abigail plots to be born again by Miriam. Jonathan is encouraged by the family ghost to throw her down the stairs like his ancestor did when he found out his wife was pregnant with another man�s child, but before Jonathan has summoned the strength to do that, Miriam throws him down the stairs and he dies. Soon after Miriam gives birth to Abigail and dies while giving birth. Soon after the seven horsemen arrives to kill Abigail.