bookpart, titles and table-of-contents

[Federico Bruni]

I'm trying a different approach¹ in creating a book.
Let me first explain what I 'd like to achieve.

Let's say I have some scores which I'd like to print either on their own 
and inside a book which includes them all; and I want the title to show 
up correctly in both cases without having to touch any single score.
It seems that \bookpart is perfect because I can use an \header block 
for each score.

But I have two problems in the book file which includes the bookpart files:

1. page numbers in the table of contents don't work: I see a ? instead 
of a number

2. between the two scores a page with the main title is printed

See minimal example attached.
Can you help me?
Thanks in advance

[1] http://lists.gnu.org/archive/html/lilypond-user/2012-05/msg00057.html
(this is what I used to do)
--
Federico

book.ly
Description: Text Data

bookpart1.ly
Description: Text Data

bookpart2.ly
Description: Text Data