Paul Shaffer

Paul Allen Wood Shaffer (born November 28, 1949) is a Canadian singer, keyboardist, composer, actor, author, comedian, and musician who served as David Letterman's musical director, band leader, and sidekick on the entire run of both ''Late Night with David Letterman'' (1982–1993) and ''Late Show with David Letterman'' (1993–2015). Provided by Wikipedia