Worth it - Make sure you get the CD
Bought this as a companion to the same author's "Musical Direction for Improv and Sketch Comedy".
If you only want to learn how to perform in an improvised musical, this will give you the tips and tricks. Keep in mind, developing your creativity is the best thing to do. The exercises will get you started.
Also, your club or school may do things differently, but this will provide an excellent perspective on the subject.
The CD is vital. Don't order the book if it does not have the CD.