Re: "it's the only Bacharach/David musical in existence".
That's not entirely true. There is another but it was a film musical, the awful "Lost Horizon" with Sally Kellerman, Liv Ullman, George Kennedy and others "singing" some pretty awful songs.
You can check out the trailer which features some of the songs and some funny dances at:
http://videodetective.com/home.asp?PublishedID=480476 Lost Horizon (1973)
"I've lost everything! Luis, Marty, my baby with Chris, Chris himself, James. All I ever wanted was love." --Sheridan Crane "Passions"
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"Housework is like bad sex. Every time I do it, I swear I'll never do it again til the next time company comes."--"Lulu"
from "Can't Stop The Music"
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"When the right doors didn't open for him, he went through the wrong ones" - "Sweet Bird of Youth"
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"Passions" is uncancelled! See NBC.com for more info.