Constructing Walking Jazz Bass Lines Book I -The Blues in 12 Keys is a complete guide demonstrating the devices used to construct walking bass lines in the jazz tradition. Part 1 demonstrates the techniques used by professional jazz bassists to provide forward motion into bass lines, while providing a strong harmonic and rhythmic foundation. Part I includes triads, 7th chords, voice leading, playing over the bar line, chord substitutions, pedal points, harmonic anticipation and chromatic approach notes. The exercises are designed to give the Electric Bassist strong jazz bass lines in the bottom register of the instrument. As an added bonus for the Electric Bassist Part 1 provides a complete study of the Blues in F whilst in the first and open positions. This is an excellent technique builder. Part 2 expands on the lessons and techniques used in Part 1 providing the bassist with the previous devices used in professional level bass lines in all 12 keys. Included is over 150 choruses of Jazz Blues lines in all 12 keys using the whole register of the instrument. There are many advanced principles applied in the following bass lines whilst never losing sight of the functioning principle of the bass in the jazz idiom. To provide a strong foundation of rhythm and harmony for the music being played & providing support for the melody and or soloist.