Metcalf's award marked the second consecutive Tony for the actress, who previous year won for best lead actress in a play for her performance in "A Doll's House, Part 2".
The Band's Visit marks Stachel's Broadway debut. Thorne wrote the script and is credited for the award; however, Rowling receives a Tony by way of producing the play through the shingle Harry Potter Theatrical Productions, which produced alongside leads Sonia Friedman and Collin Callendar.
Broadway thumbed its nose at Tina Fey and touristy musicals Sunday night by showering "The Band's Visit", a lovely, human show, with 10 Tony Awards, including Best Musical.More news: Fans wonder whether LeBron's injured hand cost the Cavs a championship
Andrew Garfield won the first prize of the night for his role in Angels in America and dedicated the prize to the LGBTQ community: "We are all sacred and we all belong".
The brief, nearly token, insult provoked a disproportionately strong reaction from the audience at New York's Radio City Music Hall.
"The Band's Visit", about Egyptian musicians stranded in a small Israeli town, also won acting awards for stars Tony Shaloub, Katrina Lenk and Ari'el Stachel, as well as best book, score, director, orchestration, sound design and lighting.More news: Wynne Stepping Down As Ontario Liberal Leader After Election Disaster
Radio City Music Hall was awash in tears when the drama students from Marjory Stoneman Douglas HS in Parkland, Fla., sang "Seasons of Love" from "Rent", a show written by Jonathan Larson, who, like the kids caught up in the February massacre at the school, died far too young. The smart bet was that Broadway would give her a Tony for her script. Check out show clips from The Band's Visit below. She accepted in tears, recounting that when she moved to NY, she was told to change her last name to Matthews or she wouldn't work.
Worst Sia Cover: Hosts Josh Groban and Sara Bareilles returned to the stage for a Broadway-themed take on Sia's song, "Chandelier". The show went on to win best musical revival, beating "My Fair Lady" and "Carousel".
In other wins, Glenda Jackson added to her impressive resume with a Tony Award for best actress in a play for her work in a revival of Edward Albee's "Three Tall Women". Spacey's ceremony last year drew 6 million viewers, which represented a drop of approximately 31 percent in total viewers from the previous year.More news: Kingdom Hearts 3 release date announced