5 Actors Whose Singing Voices Will Surprise You

Clint Eastwood 

in "Paint Your Wagon" (1969)

Peter Lawford 

in "Good News" (1947)

Dana Andrews
in "The North Star" (1943)

[solo starts at 1:27]

Sean Connery 
in "Darby O'Gill and the Little People (1959)

Christopher Lee