Video - Link
For the print version, look for the book on amazon in your country!
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!
I have written several books on the electric bass, available on my website and on Amazon or Lulu. com: 
Theory and Practice of Bass: Volume 1 (2015)
500 Exercises for Bass (2018)
John Deacon (Queen): 185 Bass Transcriptions (2020)
Jaco Pastorius: 70 Bass Transcriptions (2020)
Jaco Pastorius: The Complete Study - Volume 1 (2021) 
Complete Applied Harmony course for Bass Guitarists (2021)
John Deacon: The Complete Study (2021) 
The Walking Bass (2021) 
The Electric Bass Workshop (Setup, Modifications, Repairs) (2021) 
The Fretless Bass (2022) 
Jaco Pastorius: The Complete Study - Volume 2 (2022) 
Red Canzian (Pooh): over 40 bass transcriptions (2022)
Flea (Red Hot): over 60 bass transcriptions (2022)
Super collection of sheet music: over 1500 songs (2023)
Profession: Bass Player (2023)
Studying classical music on electric bass (2023)
The Best of Bass - Volume 1 (100 Transcriptions) (2023)
Studying chords on bass (2023)
The Best of Bass - Volume 2 (100 Transcriptions) (2023)
Definite study of scales and arpeggios on the electric bass (2024)