Manilow entered hospital after talks on his cancelled musical Harmony

The 57-year-old was released from the California hospital after doctors said his heart rate had returned to normal.

The pains were brought on by stress after two days in legal arbitration involving ownership of the musical Harmony, his spokesman said.

"My heart was broken, but the doctors put it back together, and I will continue to fight," Manilow said.

The singer is trying to win back the rights from producer Mark Schwartz, whom he blames for a Broadway failure.

"It literally broke my heart to sit for two days and watch these beautiful people of the creative team testify because of the incompetence (that) brought down our show," he said in a statement on Monday.

Chart hits

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.

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.