Paul Allen Wood Shaffer , CM ( ; born November 28 , 1949 ) is a Canadian  ? id=Um34PSp_zVkC & pg=PA138 & lpg=PA138 & dq=Paul+Shaffer+citizenship & source=bl & ots=4NLU9xcpxW & sig=uoRsoi6PUeoUSIG3hXDY71HecyI & hl=en & sa=X & ved=0ahUKEwi4kPSontDUAhWFCsAKHSErCBcQ6AEIYDAJ # v=onepage & q=Paul % 20Shaffer % 20citizenship & f=false  singer , actor , voice 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 ) .
Paul Shaffer is a Canadian singer .