Roberta Flack shortened her performance at the historic Apollo Theater on Friday night when she was hospitalized.
The singer, 81, appeared at a charity concert for the Jazz Foundation of America when she fell ill. according to TMZ.
A Flack representative did not immediately respond to people's request for comment.
Flack was able to walk off the stage on her own, but needed an ambulance to take her to a hospital in Harlem, New York.
James Mtume, a musician, shared a photo of herself on Friday before the show Flack, smiling in sunglasses, wearing dark sunglasses and a gold-trimmed top.
"Back together again! With the best! #Mtume # RobertaFlack # Apollo #JimmyHeath", he wrote in the caption.
The singer is best known for her No. 1
While Flack was not the first person to perform and record "Killing Me Softly with His Songs" (Lori Lieberman recorded them in 1971), Flack released her version in January 1973, where she remained in No. 1 position for five weeks.
She is the only singer to win the Grammy Award for Best Record of the Year for two consecutive years.