FILE - Duncan Sheik poses for a portrait on Thursday, March 24, 2016, in New York. (Photo by Brian Ach/Invision/AP, File)

NEW YORK (AP) — Duncan Sheik, the Tony- and Grammy-winning singer-songwriter who crafted the music for “Spring Awakening,” has died. He was 56.

Sheik died Thursday night, according to a post on his Instagram page. “The world has a lost a singular talent, and deeply influential voice in music and theater,” the post reads. “His musical legacy will continue to inspire generations to come.”

Sheik had been best known for his lasting radio hit “Barely Breathing” when he turned his sights on Broadway with “Spring Awakening,” resulting in the envelope-pushing show that musicalized teenage angst.

“With the exception of our director, we are all kind of Broadway outsiders. We wanted to shake things up a bit. And we just set out to make this really cool piece of theater,” Sheik told The Associated Press in 2007, as the show swept Tony nominations.

Sheik also tackled musicals based on “American Psycho” and “Alice in Wonderland,” and “Barely Breathing” spent 55 weeks on the Billboard Hot 100, peaking at No. 16. But he was probably best known for “Spring Awakening,” which ran for over 860 performances on Broadway starting in 2006.

“His deep feeling and his delight gave us so much beauty,” playwright and actor Eisa Davis wrote. “Duncan, thank you for your friendship and for the sublime music.”