Online and in person classes in music theory for musical theatre performers.
The most confusing about what does (and doesn't) go into your audition book is all the conflicting advice.
In this (free!) mini online course, I interviewed top NYC casting directors, vocal coaches, and Tony Winner James Monroe Iglehart on what you really need.
PS: It's recommended that all voice students in my studio go through this course! ;-)
TheoryWorks is an online series of courses that teaches musical theatre performers how to read sheet music and hold difficult harmonies.
The courses teach the skills performers actually need on the job, and relevant to them and their careers. All of the examples come from Musical Theatre, and actors have access to the materials for life.
TheoryWorks also holds a number of in person and online masterclasses with people like Broadway actor Amy Justman (Carousel, Gentleman's Guide, Phantom, InTransit, and more), music director Dan Micciche (Wicked), and more.
Check out TheoryWorks level 1 and 2 courses here.