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In music, two notes, intervals, or key signatures are enharmonic if they sound the same but are written in different ways. For example, C-sharp and D-flat are enharmonic notes. C-sharp major and D-flat major start on enharmonic notes, so they are enharmonic key signatures, but they have different numbers of sharps and flats. An augmented fourth and a diminished fifth are enharmonic intervals, because they both cover 6 half steps.[1]

References[change | change source]

  1. Benward, Bruce; Saker, Marilyn (2003). Music in Theory and Practice. Vol. I. p. 7 & 360. ISBN 978-0-07-294262-0.