I know that there have been some posts about this "new" movie on one of the theater threads, but I think that it deserves its own thread.
In 2003, Rick McKay's BROADWAY: THE GOLDEN AGE, BY THE LEGENDS WHO WERE THERE arrived in theaters, and true believers everywhere rejoiced. In just under 2 hours, this remarkable documentary packed in countless reminiscences, priceless glimpses of the vanished era in question (an eye-opening bit of Barbara Bel Geddes and Ben Gazzara in CAT ON A HOT TIN ROOF, for example, or Laurette Taylor's screen test) and so much more, while never feeling hackneyed or dull. Sequence after unforgettable sequence unfolded -- my favorites include the Kim Stanley section (especially Frank Langella's high-camp recitation of moments of hers he wished he'd seen) and the Gretchen Wyler/SILK STOCKINGS story ("Sherry O'Neil!") -- and the whole thing exuded a bone-deep love of the art form and its great practitioners, right down to its unforgettable finale.
The ensuing years offered promise after promise of a sequel, BEYOND THE GOLDEN AGE. The DVD had raw footage, and in 2013 a 7-minute trailer dropped that suggested a worthy successor to the original. But then, in 2018, Rick McKay died (at 57!!), and we despaired of ever seeing what he was working on.
Well, now something purporting to be that sequel has indeed arrived -- you can stream it via PBS' Great Performances' page. But for me it was a spectacular disappointment.
One of many remarkable things about the original was how many surprises it held even for those of us who think we've heard all the stories and know all the history. The sequel, by contrast, offers very little of interest to anyone who's trod this ground before. The extended sequences are all about famous musical hits -- ONCE UPON A MATTRESS, BYE BYE BIRDIE, PIPPIN, A CHORUS LINE, AIN'T MISBEHAVIN', 42ND STREET -- but don't offer a single detail I hadn't heard/seen.
A few moments -- the background to Jane White's participation in MATTRESS . . . a charming sequence in which actors talk about watching great performances from the wings . . . a wonderful 5-minute look at the painful circumstances behind Glenn Close's taking over for Mary Ure in 1974's LOVE FOR LOVE -- suggest what might have been. (IIRC, that last item may be the only part of the documentary that lingers on a non-musical production.) But comparing the released film with the 7-minute trailer from 8 years before makes me seriously question how committed anyone involved really was in continuing Rick McKay's actual work -- or at least to what degree any of them understood it.
Your mileage may vary.
P.S. How do you treat the period in question (1959-1981, more or less) without delving into ANY of the Sondheim/Prince productions, ALL OF WHICH took place then?