NEW YORK (REUTERS) - Pop star Taylor Swift's 1989 World Tour-Live concert video will be available exclusively on Apple Inc's music streaming service, Apple Music, starting on Dec 20, Apple said in a tweet from Apple Music's Twitter account on Sunday (Dec 13).

Swift made the announcement as she celebrated her 26th birthday on Sunday. She also tweeted a trailer for the concert video and said: "Thank you so much for all the birthday wishes. I have a little surprise for you." The trailer's description listed Jonas Akerlund as the video's director.

The singer added that an interview discussing the video would be broadcast at 9am PST (7pm Singapore time) on Monday on Beats 1, Apple's radio station. Apple officials were not immediately available for comment.

Apple introduced Apple Music in June. Apple chief executive Tim Cook said in October the music streaming service had netted more than 6.5 million paid users, and that an additional 8.5 million people were participating in a free trial.

Swift said in June she would put her hit album 1989 on Apple Music, days after the tech giant bowed to pressure from Swift and some independent music groups and labels and agreed to pay artists during a free trial of its music service.

Swift's decision came after she pulled her entire catalogue of music from online streaming platform Spotify in November 2014 and refused to offer 1989 on streaming services, saying the business had shrunk the numbers of paid album sales drastically.

Terms of the deal were not disclosed. But Bloomberg noted that it follows other arrangements that Apple has struck with star musicians to publicise Apple Music and produce programming for its service.

Rapper Drake and producer Pharrell Williams have been involved with Apple Music since its introduction in June, and in November, Apple introduced a television commercial featuring country singer Kenny Chesney, Bloomberg said.