The bottom end of the list is probably more interesting than the mainstream top, with unexpected appearances by The Umbrellas of Cherbourg, All That Jazz, Hedwig and the Angry Inch, Dancer in the Dark and so on. Was it being made into a (rarely screened) film or just having "Send in the Clowns" that got A Little Night Music onto the list? A good thing, either way. Curious that they list the 1962 film version of Gypsy but the pic and review are for the 1993 TV movie with Bette Midler.
And did anyone really vote for The Jazz Singer (#65) as the "Best Musical"? Historically important, for sure -- but best? Smells a bit fishy to me...