Whistle this!

The new challenge to 6th is to learn to whistle a tune!
"The Bridge on the River Kwai" is a famous film and the theme tune is very well known.
If you can already whistle, then you have a head-start; if you can't, then you'd better start practicing!
Here is a video clip from the film incorporating the tune. The melody repeats itself many times, you only have to whistle it once.
Good luck and happy whistling :)
Bridge on the River Kwai