After G, the musical pattern restarts at A in a higher register (an octave). Between most of these natural notes sit five accidental notes (sharps ♯ and flats ♭), giving us twelve total chromatic pitches within every octave. On a piano keyboard, moving one key immediately to the right raises pitch by one semitone (half step). Understanding this cyclic alphabet of 12 notes is the essential foundation of all scales, chords, and melodies.
KEY TAKEAWAYS- The 7 natural notes: A, B, C, D, E, F, and G.
- Sharps (♯) raise a note by 1 semitone; flats (♭) lower it by 1 semitone.
- Natural half-steps: B–C and E–F are immediate neighbors with no black key between them.
- An octave spans 12 semitones before repeating at double the acoustic frequency.
Tap the piano keys in the Scale Explorer from C to B, listening to how pitch climbs steadily with each semitone step.
Open the scale explorer ↗Connecting Theory to Sound
Music theory is not an abstract set of rules—it is the vocabulary that describes what makes your favorite songs sound so resonant. Use our interactive instruments to hear each concept in real time, and return whenever you want to explore new musical keys.