(Berklee Press,Hal Leonard)

Walkin is an instructional book and video on walking bass technique. The book explains the various approach notes and scale type lines 
as well as fingerings for two octave scales and modes.Arpeggios and chord spellings also shown. There are over sixty examples of chord progressions to blues and jazz,standards.
The bass lines use the techniques described 
in the beginning and are melodically interesting.  The video shows the author with his basses (acoustic and electric), demonstrating the bass line techniques described in the book along with various rhythmic articulations and embellishments
.He also explains how to count phrases in song forms and play ballads and up tempos.
 

22 Contemporary Melodic Studies for Electric Bass, Vol.1. is a book of contemporary etudes which are designed to enhance ones solo and 
improvisational technique while also challenging reading skills.The techniques and solo concepts used are explained in the beginning.
Some of thes include: 
Approach notes,Tensions and upper stuctures, Jazz, Harmonic and melodic minor modes, Pentatonics, Indirect Resolution, Sequences, Reharmonization, Harmonic Implication, 
Deceptive Resolution,Modal Interchange, Tonal Superimposition and many more. 
With diligent practice 
these studies can turn any serious bassist 
into a monster soloist.