Playing blues bass lines is essentially working some basic note patterns around the root note of each chord in the 12 bar blues progression.
Here’s the outline of the basic blues bass guitar pattern, which you will apply to each chord (I, IV, V) in the blues progression.
Here’s a view of the pattern on the fretboard itself. Notice the root notes marked “R” in blue diamond shapes. The rest of the notes are circles and you fret those notes going up the neck (ascending in pitch) and going back down (descending in pitch.)
Next, here’s a simple layout of the 12 bar blues structure, counting “1” for each line. Change chords as noted and keep counting each line to lead you to next chord. It really helps to internalize this by actually counting out loud with the changes.
Finally, here’s a video demonstration of the basic blues pattern for the 12 bar blues played in the key G:
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