Here is another clue: use your ear and try to guess what happens at 42" and then at 2'16" of Desafinado.
Here is a question to help you: how does the bossa nova style sound? Canned or not? And why?

Another suggestion: try to concentrate on the single elements of the two songs:
1- the style
2- the instruments used (namely the piano, the tenor and soprano sax, the acoustic guitar): do they remind you of something you are familiar with?
Based on these elements, some of you already guessed right, but the truth is somewhat more complex...

[This message has been edited by Dreamer (edited 10-20-2008).]