If any new ones come up, it would be posted in a newsletter. They don't come out every few months, just whenever an artist gives permission to show them. Most artists prefer to sell their DVDs I think. Don't forget there is an extensive list of shows to view. You can find any subject you are interested in learning about by doing a Search on the show list.
Kathy
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At the top of any page, place your cursor on "Watch", then click on "Featured Guest DVDs" from the drop down menu. There are a variety of DVDs to watch. You might not see some from years past as the artist may only have allowed a one year run on them.