I agree with JRB. While it's difficult to be objective in this, one of the most subjective of all art forms, there are works that are, by any definition, "perfect" in their primary elements -- book, music, lyrics -- and that in their original productions (or in a few rare cases, in later definitive productions) demonstrated an ideal marriage of performance, direction and design. There are several shows that I love that I must admit have flawed books, or brilliant shows that have songs in the score that aren't great or constitute filler, or that overall flat-out work better on paper (or on CD) than they ever do in performance. By this criterion, I eliminate several of my favorite shows, but with that in mind, how about these 20 candidates (chronologically):
-- "Showboat" (momma of them all -- a little clunky these days, but still effective)
-- "Porgy and Bess" (really an opera, but interlaced with jazz and written FOR the musical theater, debuting for the Theatre Guild in 1935 -- the greatest musical score ever written by an American composer to this day ....certainly unparalleled by any other composer who's primarily associated with musical theater. A masterpiece on every level from beginning to end)
-- "Pal Joey" (ahead of its time then and perhaps still; great score, but the dark, anti-hero protagonist is still a hard sell -- maybe Hugh could have a go at it)
-- "Oklahoma" (plot + music + dance = it still works)
-- "Annie Get Your Gun" (not crazy about the last revival -- though Reba was great -- but who can argue with the score)
-- "Guys and Dolls" (maybe the greatest musical comedy; flawless book that is still extremely funny over 50 years later; every song is perfection and perfectly placed; even when it's not well cast, it's such an amazing piece of construction that it still works)
-- "Threepenny Opera" (the first off-Broadway hit show)
-- "My Fair Lady" (we all take it for granted -- myself included -- but Lerner's adapation of Shaw's Pygmalion is masterful, as is the score by he and Loewe)
-- "West Side Story" (I wonder if I'll ever see a production that is worthy the work by Robbins, Bernstein, Sondheim and Laurents. I'm a bit underwhelmed by the OBC recording by Kert and Lawrence and the movie nailed the choreography, but then also had Richard Beymer (????) and Natalie Wood in a black wig. Hopefully, someday somebody (Jerry Mitchell?) will do a revival that matches the brilliance of the creators).
-- "The Music Man" (Corny, but flawless)
-- "Gypsy" (Perfection. But Rose must be truly larger-than-life for the show to completely work and few, if any, Roses can match the intensity of the orignal)
-- "Hello Dolly" -- not sure why to include it, but not sure why to leave it off.
-- "Fiddler On the Roof"
-- "Cabaret" -- ??? (personally, I think the Fosse movie improves greatly on the 1966 original -- remember this last revival incorporated numbers from the movie -- and Fosse was right to ditch the Fraulein Schneider/Herr Schultz subplot which is a drag on the book, IMO. Still.....)
-- "1776" (never has such a hoary subject matter been made so endlessly compelling and entertaining)
-- "A Chorus Line" -- (a seemless marriage of book, score, choreography, staging and performance)
-- "Chicago" -- (Fosse's and Kander & Ebb's best work; prescient book; brilliant score and choreography)
-- "Sweeney Todd" (hard to choose a "Sondheim's greatest," but hard not to choose this one; Genius score and book and great staging from Prince)
-- "Evita" -- (Webber's best, I guess)
-- "Les Miz" -- (the best of the mega-musicals)
There are another half dozen or so I might add (including a few favorites of mine) but they're all harder to defend because of certain flaws. Anyway....
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney