A pentatonic scale has five notes per octave. The major pentatonic is made by leaving two degrees out of the major scale, which gives producers a compact starting set for melodies and improvisation. You will find pentatonic writing in blues, rock, pop, folk, and many other traditions.
Why five notes work so well
The pentatonic scale removes the two notes that create the most tension from the major scale - the 4th and 7th degrees. Without those degrees, common clashes against basic major-key chords are less likely. It is a useful starting set, not a guarantee that every note will fit every chord.
Major scale minus tension notes
Remove degrees 4 and 7 = pentatonic
The major pentatonic
Bright, happy, and safe. The major pentatonic keeps degrees 1, 2, 3, 5, and 6 from the major scale.
C major pentatonic
C major pentatonic - degrees 1, 2, 3, 5, and 6
Semitones from root: 0, 2, 4, 7, 9. It is common in country, pop, folk, and melodies that need to stay close to the key's basic harmony.
The minor pentatonic
The minor pentatonic is widely used in blues, rock, and pop music. It keeps degrees 1, 3, 4, 5, and 7 from the natural minor scale - or equivalently, degrees 1, b3, 4, 5, b7 from major.
A minor pentatonic
A minor pentatonic - a five-note scale used across blues and rock
Semitones from root: 0, 3, 5, 7, 10. This five-note collection is common in guitar-based blues and rock. Its notes often work over minor and dominant chords, but the chord tones and phrasing still determine which notes sound stable in a given bar.
Same notes, different root
Just like C major and A minor use the same notes, C major pentatonic and A minor pentatonic use the exact same five notes - they're relatives.
Same five notes, different starting point
Hear the difference
Try it
Use the C-major pentatonic piano to make a short five-note phrase without touching F or B. Then try the same five pitch classes with A as the final note. Predict how changing the resting note will alter the character before playing it.
Check the note list: C major pentatonic and A minor pentatonic share C, D, E, G, and A, but they establish different tonal centres.
Key takeaway
Pentatonic scales use 5 notes by removing the "trouble" notes from 7-note scales. Major pentatonic: 0, 2, 4, 7, 9 (bright, safe). Minor pentatonic: 0, 3, 5, 7, 10 (bluesy, rocky). They're relatives - C major pentatonic = A minor pentatonic. When in doubt, pentatonic is the cheat code.
Next: add one note to the minor pentatonic and you get the blues scale.
Generate with pentatonic scales
Select "Major Pentatonic" or "Minor Pentatonic" in Starts for melodies that just work.