Twelve bars, three dominant chords, and a handful of bent notes — the form under most jazz, rock, and R&B. The harmony is I7, IV7, V7; the melody leans on the blue notes (the ♭3, ♭5, and ♭7) that fall between the piano keys of the major scale. Pick a key and a variant, play the changes, and solo with the blues scale over the top.
The blue notes are . Click the scale to solo — the blue notes are coloured.