No longer just videos of cats playing the piano. YouTube has over the past couple of years has become a great place to find legitimate documentaries and interviews dealing with all kinds of topics as well as performances. If you are not sure if a documentary or interview is legitimate ask your instructor or a librarian.
If you are an Amazon Prime (paying) member you have access to a lot of instant videos. You can also (for a fee) watch streaming documentaries from Amazon.
Streaming Video Documentaries from Kanopy and Films on Demand
Streaming documentaries, interviews, and lectures across a wide range of topics. Includes documentaries, performances and analysis of Shakespeare and his works.
Streaming classic cinema, indie film, and documentaries from all over the world. This movie database currently has the 1979 film version of The Tempest.