Mission: Impossible?

For those of you who don't know, I have decided on a new mission in life. I'm not sure I'll ever be able to do it, but I have to try.

Step 1: Find a harmonica to use
Step 2: I have no clue....maybe practice....

What is this mission?

It's to do this:

http://www.youtube.com/watch?v=mWWoZEl4oXA

Sorry I couldn't get the video to work on the blog. The code wasn't working out for me.