Video - Link
For the print version, look for the book on amazon in your country or on lulu.com
This book (precisely the tenth that I write about the bass) is a "journey" to discover what for me is the most beautiful instrument in the world, the fretless bass. I had in mind to do it for quite some time, since I always thought that there is too little material dedicated to the "fretless".
For any information, questions and anything else you can write to me at my email address igorsardi@gmail.com.
Together with the book, you will receive a link to download all the attached videos, audio examples and the basics without bass!
TOPICS:
History of the instrument and collection of commentary and interviews with the greatest fretless bassists in history
Intonation 
The Sound
The Vibrato 
The Glissato
The sustain 
Studying the fretless bass on the fretted! 
Playing songs with the fretless
..and much more!