Ray is correct,

With these two scale positions alone, the "G scale" position and the "C scale position" moved up and down the fretboard you can play any song you want.

Get someone to show you how scales in each key relate to standard pop chords in each key.

It is worth a lesson or two. Trust me. smile

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G scale position.png (10.16 KB, 43 downloads)
C Major Bass Sacle.png (10.3 KB, 43 downloads)
G Major Bass Scale.jpg (11.53 KB, 39 downloads)