A Minor Pentatonic, Mapped for the Bass
Where A Minor Pentatonic lies on this seat's fretboard, and how a blues phrase leans on it.
A Minor Pentatonic runs 5 notes to the octave, laid across this seat's EADG fretboard with every A marked. A blues phrase is short and keeps coming home to one pitch; the marked notes are where it comes home to.
Gritty, bluesy, and direct — five notes with no half steps, so each one lands with attitude over a minor or dominant chord. The sound of rock and blues lead playing.
Heard in: Blues, rock, hard rock, metal, funk, and soul solos — the first scale most lead players learn and the one they never leave.
On the bass a scale supplies the notes between one chord and the next — the steps a line takes on its way to the change — far more often than it is played as a run.
Whatever scale you start from, the blues bends it: the third and the seventh get pushed flat, or somewhere between flat and natural, and that pull against the chord underneath is most of what the idiom sounds like.