I love the comments on Legs Diamond. I recognize it as a poor show (though the idea was a good one), but I always enjoy listening to the CD. Same with Metropolis and another not mentioned: the London cast recording of Windy City (musicalization of The Front Page). Some really good tunes on there.
What are five flops everyone would deem must own? That's loaded with subjectivity, but if we're going with the "technical" definition of "flop", I believe all of the following should be in everyone's collection:
Goldilocks
She Loves Me (OBC or revival)
Into the Woods (OBC)
A Tree Grows in Brooklyn
Do Re Mi (OBC)
On the Twentieth Century
Ragtime (OBC)
Mack and Mabel
Parade (Brown)
Caroline, or Change
Rags
The Secret Garden (Simon)
Merrily We Roll Along (OBC)
Chess (OLC)
The Mystery of Edwin Drood
Legs Diamond
Big
Titanic
The Scarlet Pimpernel (OBC)
Jekyll and Hyde (2-disc)
Flahooley
Zorba (OBC or revival)
The Rothschilds
The Grand Tour
The Rink (OBC)
Romance/Romance
Aspects of Love
Passion (OBC)
Anyone Can Whistle (OBC or Concert)
Nick and Nora
Little Me
I Had a Ball
Flora, the Red Menace (OBC)
It's a Bird! It's a Plane! It's Superman!
Paint Your Wagon
Candide (OBC)
Whoop-Up
Take Me Along
Wildcat
Subways are For Sleeping
How Now Dow Jones
All American
70, Girls, 70 (OBC)
Follies (OBC or Papermill)
The Wild Party (LaChiusa)
Blood Brothers (1988 or 1995 London cast)
Kiss of the Spider Woman (OBC)
Jane Eyre
Sunset Boulevard (I personally prefer OLC, but a case could be made for OBC)
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian