This is a simplified, watered-down waste of time and money for me. If you are expecting the signature horn licks and classic sound of the band Chicago, it is absolutely not in this book. I hate this book. Keys are changed. Even meters are changed here and there like in Colour My World(originally in 12/8 but not the right way here). The cover says "recorded by Chicago" and not AS recorded by Chicago. There are no peeks inside the book available to view on the internet or at least none I have found as of now. If there were, I would not have purchased this book. If you want to play something cheesy and that is just another music lesson, go for it. If you want to play the music as Chicago recorded it, use this book to level a table where one leg is shorter than the other three, then look elsewhere. I had to give it a star in the rating so the review would save, but there are no values there less than zero. Please take this review to heart if you were looking for the real thing and do not be misled.