Paul Shaffer, Canadian-American singer, keyboard player, and bandleader (CBS Orchestra)
Paul Allen Wood Shaffer (born November 28, 1949) is a Canadian singer, composer, actor, author, comedian, and multi-instrumentalist 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).