This website is available for personal and commercial use.
The short version is that you can use the site as intended by design. You may view all pages. You may use any inline audio/video players that are present.
You may not violate the copyright on any of my material. Such violations may be dealt with to the fullest extent of the law. Then again, I may turn a blind eye. But do you really want to roll the dice on that call?
Use common sense, and you should be fine.