As many people have already said, this is a great flash. It's (for lack of a better word) educational, and helps users, putting it bluntly, not be pricks.
There are only two improvements I can think of:
1. The music, it's good, classic even, but the repetition can get annoying. My favorite solution to this is giving an option to choose a track, nothing extreme, maybe just one or two extra songs.
2. After getting a review (or lack of whistle) wrong, it should give some sort of indicator, nothing too obvious like giving away the answer, but merely something like a small and/or quick buzzer noise. I think it will make the game easier, but not TOO easy. After all, there's still only a 1/4 chance of getting the answer right after your first guess.
In conclusion, an excellent flash for anyone and everyone on Newgrounds, be it as a tutorial, an achievement farm, or simply to watch the file get chased to Yakety Sax (the Benny Hill theme).
10/10, 5/5, and I'll even throw in a favorite.