You are in for a treat. Not only great behind the scenes stories of the making of his shows but also wonderful chapters on lyric writing, orchestrations, casting, and recording cast albums.
For anyone interested in the theatre is is an essential book.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com