Hailed by many as the world's greatest harmonica player, John Popper has redefined the instrument. As the lead singer and principal songwriter of Blues Traveler, Popper has performed for more than 30 million people over 2,000 live dates and composed such radio staples as "Hook," "But Anyway," and "Run-Around," the longest-charting single in Billboard history. He has appeared with Eric Clapton and B. B. King at the White House, welcomed the...