B♭ blues scale on guitar
B♭ D♭ E♭ F♭ F A♭ (1 ♭3 4 ♭5 5 ♭7)
Minor pentatonic plus the "blue note" ♭5, used as a passing note, not a place to sit.
The whole neck
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 E A D G B e F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭ B♭ D♭ E♭ F♭ F♭ F A♭ B♭ D♭ E♭ F♭ F A♭
Low E string at the bottom.
Open it on the interactive fretboard
The 5 box positions
Boxes: the standard five shapes, two notes per string, one finger per fret. Learn one, then the next one up: they share an edge. Dots show scale degrees: 1 is the root.
Box 1 (frets 6–9)
5 6 7 8 9 10 E A D G B e 1 ♭3 4 5 ♭7 1 ♭3 4 5 ♭7 1 ♭3 ♭5 ♭5
Box 2 (frets 8–12)
7 8 9 10 11 12 13 E A D G B e ♭3 4 5 ♭7 1 ♭3 4 5 ♭7 1 ♭3 4 ♭5 ♭5 ♭5
Box 3 (frets 10–14)
9 10 11 12 13 14 15 E A D G B e 4 5 ♭7 1 ♭3 4 5 ♭7 1 ♭3 4 5 ♭5 ♭5 ♭5
Box 4 (frets 0–5)
1 2 3 4 5 6 E A D G B e 5 ♭7 1 ♭3 4 5 ♭7 1 ♭3 4 5 ♭7 ♭5 ♭5 ♭5
Box 5 (frets 3–7)
2 3 4 5 6 7 8 E A D G B e ♭7 1 ♭3 4 5 ♭7 1 ♭3 4 5 ♭7 1 ♭5 ♭5