What’s an OER, you ask? Resources that are freely available, at no cost, with no copyright problems. In other words: enjoy to your heart’s content!
“Working in Theatre: Before the Show” — playlist with all kinds of interviews and such, by the American Theatre Wing — https://www.youtube.com/watch?v=o3SpQoJozkQ&list=PL31C5F6C2FE17EB61
Very very brief reference to non-western theatre origins, types, and reasons — https://www.oercommons.org/authoring/9707-introduction-to-theatre/1/view
Theatrical Worlds, OER textbook w/ acting, directing, set design, costumes, lights — http://open.umn.edu/opentextbooks/BookDetail.aspx?bookId=242
Free amazon kindle book on musical theatre auditions — https://www.amazon.com/Things-About-Musical-Theatre-Auditions-ebook/dp/B00HXY5LX2/ref=sr_1_18?s=digital-text&ie=UTF8&qid=1390438684&sr=1-18&keywords=free+books
Beginning Costume Design and Instruction course — https://ocw.mit.edu/courses/music-and-theater-arts/21m-732-beginning-costume-design-and-construction-fall-2008/
Design for Theatre: Scenery — https://ocw.mit.edu/courses/music-and-theater-arts/21m-734-design-for-the-theater-scenery-spring-2005/
Lighting Design for the Theatre — https://ocw.mit.edu/courses/music-and-theater-arts/21m-734-lighting-design-for-the-theatre-fall-2003/
Technical Design: Scenery, Mechanisms, and Special Effects — https://ocw.mit.edu/courses/music-and-theater-arts/21m-735-technical-design-scenery-mechanisms-and-special-effects-spring-2004/
Classic Plot Structure — http://cf.linnbenton.edu/artcom/performing_arts/stoned/upload/Classical%20Plot%20Structure.pdf