"Let's Call the Whole Thing Off" is a song written by George Gershwin and Ira Gershwin for the 1937 film Shall We Dance, where it was introduced by Fred Astaire and Ginger Rogers as part of a celebrated dance duet on roller skates. The sheet music has the tempo marking of "Brightly". The song was ranked No. 34 on AFI's 100 Years...100 Songs.