Justin Timberlake has vocal problems.(Photo: Matt Slocum, AP)

NEW YORK (AP) – Justin Timberlake has announced that he is postponing his Wednesday night concert in New York because his vocal chords are "severely bruised".

The pop star writes on Instagram that, on doctor's orders, he must postpone his show to Madison Square Garden. It happened on the famous stage Monday night.

Timberlake says he has postponed the MSG concert to January 31, which is his 38th birthday. He writes, "I'm going to do this to myself."

The artist has taken care. His new book, "Recoil and everything I can not see before me," will be released on October 30th.

Timberlake said in a statement that the book would highlight some of the "characters and important places" of his career. He also said the book would include tributes to his wife, actress Jessica Biel, and his 3-year-old son Silas.

According to his publisher Harper Design, Timberlake will tackle everything from his years with "N Sync" to his skits on "Saturday Night Live".

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