What's the name of this song?

The song starts at 1:15. I know it's a really popular song, but I can't remember the name:

http://www.youtube.com/watch?v=SwwDmi3Gp...
Actualizar: I'm sorry, here's the link:
watch?v=SwwDmi3GpCk

Just have to begin it with youtube.com/
Actualización 2: Thank u!!! I know it's a classic... I'm a little embarrassed by not knowing lol
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