WINSTON-SALEM, N.C. (AP) — Grammy-winning folk musician Doc Watson is in critical condition but improving at a North Carolina hospital after undergoing colon surgery.

Folklore Productions represents Watson and says he is improving after the surgery Thursday night at Baptist Hospital in Winston-Salem. A hospital spokeswoman said he remained in critical condition Friday morning.

Watson's daughter, Nancy, told The Associated Press that the 89-year-old Watson fell Monday.

The blind singer and guitarist has won several Grammys, including a lifetime achievement award. He also received the National Medal of the Arts.

He's known as a master of the flatpicking style of guitar playing, He also started Merlefest, an annual gathering of musicians in Wilkesboro named after his son, who died in a tractor accident in 1985.

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