Quick: for the pleasure of being absolutely correct, what have they just sung?
-- "You say tomato, I say tomato"
-- Let's Call the Whole Thing Off
-- I've Got My Love to Keep Me Warm
-- Shall We Dance (Gershwin & Gershwin))
-- Shall We Dance (Rodgers & Hammerstein)
-- They Can't Take That Away from Me
For extra credit which if any won the Academy Award for best song of the year? Three were eligible.