Leonard Cohen walked onto a U.S. stage for the first time in more than 15 years just one month ago. It was a triumphant return for the legendary singer-songwriter, who has reached generations beyond with his lyrical portraits. One song in particular, 'Hallelujah,' has become a signature for both Cohen and many who've come after him. In this exclusive video, Cohen performs the tune from a recent concert in London. "I want to thank all my fans for keeping my songs alive all these years," Cohen told Spinner. The gratitude is all ours.