Music notation glossary · Intervals
Unison
the same note, zero semitones
In the score
What it means
Two identical notes. The perfect unison is a note's distance to itself; the augmented unison is the chromatic semitone, C to C sharp.
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See AnotonaEvery note on this page is computed, not typed in — following the rule that also makes F# major spell its seventh degree E#, not F.