Manilow entered hospital after talks on his cancelled musical Harmony

Manilow was admitted to a California hospital on Saturday after negotiating a legal case over his musical Harmony.

He had taken part in "two gruelling days of arbitration" with co-writer Bruce Sussman, his spokesman said.

The show's run in Philadelphia was cancelled in November, an event which Manilow called the most devastating day of his life after his mother's death.

The 57-year-old will remain in the Palm Springs hospital to undergo various procedures to return his heart rate to normal, his spokesman Jerry Sharell said on Sunday.

Grammys

Manilow had a string of chart hits in the 1970s and early 1980s including Mandy, Could It Be Magic, Bermuda Triangle and Let's Hang On.

He won Grammy Awards for I Write The Songs and Copacabana (At The Copa) in 1977 and 1979 respectively.

Manilow's Ready To Take A Chance Again, from the film Foul Play, was nominated for an Academy Award for best song from a motion picture in 1978.

His musical Harmony was based on the true story of a singing group living through World War II.

Before it was revived in Philadelphia, a 1997 production of the show closed in California after mixed reviews.