The BBC Proms event at the Royal Albert Hall Saturday included an all-star cast and numbers from his hit musicals such as "Into the Woods" and "Sweeney Todd."
The stage veteran told the BBC prior to the show that he was looking forward to the rich sounds. "There is very little as thrilling as a full orchestra in a reverberant hall," he said.
The performers included Welsh opera star Bryn Terfel, a bevy of London stage stars and Oscar-winning actress Dame Judi Dench, who sang "Send in the Clowns" from "A Little Night Music."
Sondheim, who turned 80 on March 22, has been a font of material for the theater world since 1957 when he wrote the lyrics for the classic "West Side Story."
A revival of "Into the Woods" will open in the coming weeks at the Open Air Theater in London's Regency Park, the BBC said.