The first was Ezra Laderman at New York City Opera in 1993. It sank beneath a critical blizzard.
There was a music theatre production at Gothenburg Opera in 2006. It never crossed the road.
Robin de Raaff was the most musically well developed, at Netherlands Opera last year.
Now, there’s Marilyn Forever by Gavin Bryars, opening in British Columbia (where the composer mostly lives) after workshopping at Banff in 2010. I want to see it.