9. Alicia Keys (2005)
There weren't a lot of great Unplugged episodes in the 2000s, with years often passing without a single new episode. But in 2005, Alicia Keys helped bring the series back with a stunning show at the Brooklyn Academy of Music. She only had two albums worth of songs at that point, so she brought out Adam Levine to sing the Rolling Stones' "Wild Horses" and Mos Def, Common and Damian Marley for "Welcome to Jamrock." What nobody knew at the time was that Keys came close to bringing in Bruce Springsteen to play his 1973 classic "New York City Serenade" with her. "I was going to cry," she said. "The schedule just conflicted." That's a huge bummer. Had they pulled it off, it would have been one of the great moments in Unplugged history.