Washington (AFP) - Legendary Broadway songwriter Stephen Sondheim, widely credited with revolutionizing American musical theater, died Friday at age 91, his lawyer told The New York Times.

F. Richard Pappas said Sondheim -- known for musicals including West Side Story and Sweeney Todd -- died suddenly at his home in Roxbury, Connecticut, the day after celebrating Thanksgiving with friends.

"There are no words. He had them all. And the music. He was incomparable," the UK-based Stephen Sondheim Society, which is dedicated to promoting and studying his work, tweeted along with three heart emojis, one of them broken.

Born on March 22, 1930 in New York City, Sondheim was involved in musical theater from an early age, even though both of his parents worked in the fashion industry.

He started playing piano at age seven and was family friends with Oscar Hammerstein II, half of the famed musical theater writing duo Rodgers and Hammerstein who wrote shows including Oklahoma! and The Sound of Music.

Sondheim's first professional writing job was for the television comedy Topper in the 1950s. He also wrote crossword puzzles for New York magazine from 1968 to 1969, which contributed to his writing style and sense of theatrical misdirection in his plays.

His major breakthrough on Broadway came with West Side Story in 1957, quickly followed by Gypsy two years later.

Prolific Career

Throughout his more than five decades-long career, Sondheim won eight Grammy awards, eight Tony awards -- including the special Lifetime Achievement in the Theatre -- one Academy Award and a Pulitzer. He was nominated for many more Grammys and Tonys, as well as two Golden Globes.

Two of Sondheim's shows, Company and Assassins, were revived on Broadway this fall.

In 2015, then-US president Barack Obama presented Sondheim with the Presidential Medal of Freedom, the nation's highest civilian honor, for his life's work.

The composer and lyricist's repertoire includes much-loved shows such as A Funny Thing Happened on the Way to the Forum, Into the Woods, and Sweeney Todd.

Sondheim, who was gay, reportedly lived alone until his 60s, keeping his sexuality under wraps. In 2017, he married his partner Jeffrey Romley, who survives him.

"Thank the Lord that Sondheim lived to be 91 years old so he had the time to write such wonderful music and GREAT lyrics!" tweeted singer Barbra Streisand.

"Thank you for everything Mr Sondheim," tweeted Broadway actor Aaron Tveit, who recently won the Tony for best actor. "We are so lucky to have what you've given the world."

Actress and singer Lea Salonga, who was the first Asian woman to win a Tony for originating the lead role of the musical Miss Saigon, thanked Sondheim for his "vast contributions to musical theater."

"We shall be singing your songs forever. Oh, my heart hurts," she wrote on Twitter.