The 2nd most recorded song in popular music history just turned 50. We know what you're guessing--something by Elvis? A Frank Sinatra ballad? You'd be wrong. We'll give you a hint: tall and tan and young and lovely...

Check it out and hear Astrid Gilberto's 1964 version:

And see Tom Jobim and Joao Gilberto reunited many years later reprising the original.