Mellon Collie And The Infinite Sadness - Smashing Pumpkins(Yes, this is a concept album)
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I was thinking about posting that one, but I didn't want to have to justify my reasoning. A great one, nevertheless.
I would call DSOFTM a concept album. If all it takes to be a concept album is for there to be some kind of unifying theme, then Dark Side meets the criteria.
As far as my favorites go, I would say Bowie's Ziggy Stardust and Blinking Lights by Eels.
DSOTM (cause it is a concept album)
The Black Parade
The Rise an Fall of Ziggy Stardust and the Spiders From Mars
...And Justice For All
Mellon Collie and the Infinite Sadness
The Beatles (White Album)
Wish You Were Here
Thick as a Brick
The Wall - Pink Floyd
Mellon Collie and the Infinite Sadness - Smashing Pumpkins
Machina I/Machina II - Smashing Pumpkins
Tommy - The Who
Black Holes and Revelations - Muse
Good Apollo, I'm Burning Star IV - Coheed and Cambria
A couple more that I forgot (somehow):
The Human Equation - Ayreon
Fear of a Blank Planet - Porcupine Tree
Deadwing - Porcupine Tree
If I had to chose one (from both my lists), I don't think I could do it.
As for the previous poster's mention of BH&R (Muse), that's kinda pushing it. There's definitely a theme to the album, but I don't really know if it's a full-fledged concept album.
Listen (online) to MUSIC THAT KILLS PUPPIES (Mondays, 8PM est) on WKDU!
Maiden - seventh son
Yes - tales from topographic oceans
the who - tommy and quadrophina
Smashing pumpkins - mellon collie
bowie - ziggy stardust
genesis - lamb lies down on broadway and selling england by the pound
and a load more
WhiffleBallTony -Instead of doing the cowbell on vocals, you would have to do the circular rubbing motion.
If a concept album is an album that is based around a single theme, and there are no other determining factors, wouldn't Please Please Me be a concept album because all of the songs have to do with love? There is more to it than that.
Also, Sgt. Pepper's Lonely Hearts Club band is considered the first concept album, but has no central theme.
That said, Rise and Fall of Ziggy Stardust, Quadrophenia and Animals are deffinitely my 3 favorite.