Unless I missed something, the statement on Page 13 that the book is "loosely based on http://mvcmusicstore.codeplex.com
" is a bit of an understatement.
It seems to me that the book is very much a supplement to - and, for proper understanding, entirely dependent on - the MvcMusicStore tutorial on the asp.net website. In fact, when you reach Chapter 6 "Annotating orders for validation" you hit a brick wall when trying to follow along by building the solution from the book.
When I reached page 118, I found that I needed to stop and retrofit the application from the asp.net tutorial
up through part 9
It would have saved some time and minor frustration had I understood the dependency between the Book and the Tutorial from the beginning, say for example, if the Title of the book had been "Asp.Net MVC - Music Store Tutorial Supplement and Advanced Topics".
Having said that, I find that the Book and the online tutorial fit nicely together.