intervals

Difference in pitch between two successive notes (melodic interval) or simultaneous notes (harmonic interval).

octave

Interval of eight tones (e.g., from C to C).

sixth

Interval of six tones (e.g., from C to A).

fourth

Interval of four tones (e.g., from C to F).

second

Interval of two tones (e.g., from C to D).

seventh

Interval of seven tones (e.g., from C to B).

fifth

Interval of five tones (e.g., from C to G).

third

Interval of three tones (e.g., from C to E).

unison

Notes of the same pitch, or one or more octaves apart, produced simultaneously by several voices or instruments.