If you can open 3 or 4 of these,

with about 10-15 seconds successive phase shift, it gets much better.

http://www.youtube.com/watch?v=i9J27RaDr5M



The recommended videos are also good, many by the same artist (Vince Collins).

There's another one by the same artist. I won't give the full address for various reasons, but the ID is "RQ8Zh6AHNVg". Beware.