Any conductor needing information about the enormous repretoire available for orchestra must have this reference book. Many, many works are detailed in these pages - organized by composer, instrumentation, title. Also, handy index of composers by nationality and birthday/death anniversaries. If you wonder how many horns are needed to perform some symphony, or wonder if a work can be played without hiring extra percussionists, or just want ideas for future concerts, this book is a priceless resource. I think about how lucky I am to have come across this tome of information each time I open its pages - undoubtedly you will as well.