Some of my favorite flop CDs:
Candide
Legs Diamond
Jane Eyre
Seussical
The Wild Party (LaChiusa)
Goldilocks
All American
How Now Dow Jones
Pipe Dream
Allegro
Flower Drum Song (revival)
Skyscraper
Tenderloin
Kwamina
House of Flowers
Anyone Can Whistle
Merrily We Roll Along
The Rothschilds
70, Girls, 70
Flora the Red Menace
The Rink
Rags
Amour
Annie Warbucks
The Best Little Whorehouse Goes Public
Baby
Big
The Baker's Wife
Flahooley
The Beautiful Game
Bajour
Take Me Along
Plain and Fancy
Walking Happy
The Canterbury Tales
Caroline, or Change
Chess
Fifty Million Frenchmen
The Golden Apple
Heathcliff
Metropolis
High Society
It's a Bird...It's a Plane...It's Superman!
Jimmy
Mack and Mabel
The Grand Tour (Jerry Herman)
Martin Guerre
Miss Liberty
Irma La Douce
Nymph Errant
Oh, Brother!
Over Here!
Me and Juliet
Romance/Romance
Sail Away
Sugar
Starmites
Swinging on a Star
Taboo
Top Banana
Wildcat
Windy City
You're a Good Man, Charlie Brown (revival)
Zorba
Limited engagements, not flops:
Parade
Marie Christine
bwaybaby2 - You mentioned almost all Off-Broadway shows, but I'm not sure if they were actually flops. Was Smile released on vinyl?
A little clarification:
Tintypes was a flop.
Avenue Q is a hit, not a flop, whether members like it or not.
Song of Singapore, Salad Days, The Mystery of Edwin Drood were not flops.
New York Rock is a concept recording. Was it ever produced?
Lizzie Borden was a limited run at the American Stage Company and Goodspeed.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian