New audio files available!

Hello!

I've created a page that links to all of the audio files available for our Chinese classes. The page is only available internally, but you can right-click and 'Save as...' for any files you'd like to listen to offline.

We've just added three new audio segments to the four we had before:

- practice dialog for Unit 3
- "Where is my friend?" song
- "Two Tigers" song

(both songs start with just the lyrics spoken out with normal tones, then repeat with the full melody; thank you for the performances, laoshi!)