poisonivy2 said: "Merrily We Roll Along. I stand by my assertion that this was Sondheim's strongest score."
And all you would need to do is contact the Huntington Theatre in Boston to find out who all the creatives were in their incredible production last year. I would never ever ever again want to see the atrociously bad Harold Prince production, but boy would I have loved to have seen the Boston production (which originated in London) a few more times.
As for me, I would probably choose 'Darling go the Day' from 1968. Terrific story, terrific score, terrific role for the leading lady and I suspect the right leading man. Book revisions required, a couple of songs replaced. Ran 4 weeks, despite mixed reviews with quite a few raves. No advance, theatre out of the way, opened in the dead of January (which was admittedly more common in those days). Probably still be a flop, because it is decidedly old-fashioned, but who knows.