Editing Enharmonic equivalence (section)

==Examples ==
At the end of the [[Bridge (music)|bridge]] section of [[Jerome Kern]]'s "[[All the Things You Are]]", a G{{Music|sharp}} (the sharp 5 of an augmented C chord) becomes an enharmonically equivalent A{{Music|flat}} (the third of an F minor chord) at the beginning of the returning "A" section.<ref>Kern, J. and Hammerstein, O. (1939, bars 23-25) "All the things you are", New York, T. B. Harms Co.</ref><ref>Archived at [https://ghostarchive.org/varchive/youtube/20211205/OPapxr8GvGA Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20111113215422/http://www.youtube.com/watch?v=OPapxr8GvGA&gl=US&hl=en Wayback Machine]{{cbignore}}: {{cite web| url = https://www.youtube.com/watch?v=OPapxr8GvGA| title = Ella Fitzgerald - All The Things You Are (with lyrics) | website=[[YouTube]]}}{{cbignore}}</ref>

[[Beethoven]]'s Piano [[Piano Sonata No. 27 (Beethoven)|Sonata in E Minor, Op. 90]], contains a passage where a B{{Music|flat}} becomes an A{{Music|sharp}}, altering its musical function. The first two bars of the following passage unfold a descending B{{Music|flat}} major scale. Immediately following this, the B{{Music|flat}}s become A{{Music|sharp}}s, the [[Leading-tone|leading tone]] of B minor:
[[File:Beethoven Sonata in E minor Op 90, first movement, bars 37-46.png|thumb|center|500px|Beethoven Sonata in E Minor Op. 90, first movement, bars 37–45<br>[[File:Beethoven Sonata in E minor Op 90, first movement, bars 37-45.wav]]]]
[[Chopin]]'s [[Preludes (Chopin)|Prelude No. 15]], known as the "Raindrop Prelude", features a [[pedal point]] on the note A{{Music|flat}} throughout its opening section.
[[File:Chopin Prelude No. 15, opening 02.png|thumb|center|500px|Chopin Prelude No. 15, opening<br>[[File:Chopin Prelude No. 15, opening 01.wav]]]]

In the middle section, these are changed to G{{Music|sharp}}s as the key changes to C-sharp minor. This is primarily a notational convenience, since D-flat minor would require many double-flats and be difficult to read:

[[File:Chopin Prelude No. 15, bars 28-30.png|thumb|center|400px|Chopin Prelude No. 15, bars 28–29<br>[[File:Chopin Prelude Op. 28, No. 15, bars 28-29.wav]]]]
The concluding passage of the slow movement of [[Schubert's last sonatas|Schubert's final piano sonata]] in B{{Music|flat}} (D960) contains a dramatic enharmonic change. In bars 102–3, a B{{Music|sharp}},  the third of a G{{Music|sharp}} major triad, transforms into C{{Music|natural}} as the prevailing harmony changes to C major:

{{Image frame|width=210|content={{center|<score>\relative c'' { \magnifyStaff #5/4 \omit Score.TimeSignature \set doubleSlurs = ##t <bis dis gis>1 (<c e g!>)}</score>}}|caption=G-sharp to C progression.[[File:G sharp to C progression 01.wav]]}}

[[File:Schubert Piano Sonata D960 second movement, bars 98-107.png|thumb|center|500px|Schubert Piano Sonata D960 second movement, bars 98–106<br>[[File:Schubert Piano Sonata D960 second movement, bars 98-106.wav]]]]