Writing a Musical (Richard Andrews)
All "how-to" books have the same effect on me: If it's so easy, how come the author hasn't had a smash-hit? The fact is, Andrews has been involved with the development of many West End musicals and does know what he's talking about. This book might help you write a compentent musical: you need something more to write a great one!
Paperback - £9.99 Now £7.99

Musical Theatre Choreography (Robert Berkson)
Useful and interesting, if rather biased towards the classic Broadway style of musicals.
Paperback - £9.99 Now £7.19