Path
What to study before Blues scale
The minor pentatonic with one extra note, and what that note does that no other note does. Below, the concepts that come before, in the order in which one explains the next. Signed in, you see the same path minus what you already hold: your path.
Notes and semitones
The seven letter names, the accidentals that alter them, and the semitone as the system's smallest step.
Intervals
The distance between two notes, measured by a number taken from the letter names and a quality taken from the semitones.
Major scale
Seven degrees built on a fixed sequence of tones and semitones, and the reference everything else is measured against.
Key signatures
The fixed accidentals at the start of the staff, their invariable order, and the circle of fifths that organizes them.
Minor scales
The three forms of the minor scale — natural, harmonic, and melodic — and what each alteration solves.
Pentatonic scales
Five notes instead of seven, chosen so that no combination can sound wrong.
Blues scale
The minor pentatonic with one extra note, and what that note does that no other note does.