Oh my god! Dear friends!
Thank you for your questions! Maybe my answer is too late 
I did not know, that you answered to me. Sorry. NOW i see this thread the first time after so many years! I wrote no book, it was just a manuscript and i made a music-lecture 2003 in Böblingen. WHY BATIS?
Because i bought a BAGLAMAS :-), 2000 in Athens. Vamvakaris was to difficult for me but Batis has simple songs and it was easier for me to play. And i love his life, his biographie, i had the informations from the CD and from the books about Rembetiko and from the Forum rebetiko.gr.
okay, this was before many years.
Now i want to write a new manuskript: