Augmented unison

In modern Western tonal music theory an augmented unison is the interval between two notes on the same staff position, or having the same note letter, whose alterations cause them, in ordinary equal temperament, to be one semitone apart. In other words, it is a unison where one note has been raised by a half-step, such as B♭ and B♮ or C and C♯. The interval is often described as a chromatic semitone.^[1]

See also

• List of musical intervals

References