When it comes to Justin Bieber, his mentor Usher says he wants to be involved in his teen pop sensation's career for a long time. "I felt like this was a story that I’d like to be involved with for the long haul, not just a moment," he told On The Red Carpet's Jason Morrell in a recent satellite interview. "To be able to build a career that will span for years." Bieber, 16, captured the attention of industry executives several years ago by posting homemade videos of himself singing songs, including Usher's, on YouTube. This self-promotion eventually led to a meeting with Usher and a record deal. Bieber is now one of the most popular pop artists today and lends his voice to a track on the soundtrack for the film The Karate Kid, which was released on Friday, June 11. Usher made history on June 6 performing on two continents over the course of a day, playing in New York City and London. Bieber joined his mentor on stage for an impromptu performance in London, which drove the fans wild.