JUSTIN Bieber’s concert at New York’s Apollo was so electrifying, the venue lost power - leaving the pop star to orchestrate a mass singalong with the audience.

The Canadian singer was in the middle of performing with special guest Ludacris during Monday night’s set when a transformer blew, prompting fans to fear the gig would be cut short due to the technical glitch.

However, Bieber remained unruffled and urged the crowd to sing his hit Boyfriend a capella for an “epic” finale - and the results so impressed the singer, he later took to his Twitter.com page to thank his audience.         –WO