Thanks for sharing your experience.. Well, I'm checking the various possibilities, I'd need for sure to create several formats, because a standard does not exist and never it will! So, the only solution is to create different formats. One is using the various online services which I've discovered such as
http://www.joomag.com ,
http://www.myebook.com ,
http://simplebooklet.com .
The problem is that this way is not possible to protect the book, it is freely available online which I do not want. I've to learn more about e-book technical issues for media embedding. The question is: which e-book we're talking about? I've seen in two days so many formats which run on so many different devices!
Mainly, my book is a PDF with midi and mp3 files as separate files. It is a normal PDF which should be printed to be practiced on the piano.
I wanted just make some different versions for tablets (iPad, Android, Windows) and the main e-book readers, because some of students and customers requested about... So, I'm checking if there is a way to create such formats ......