Topmusicanswers
Enharmonic Notes C double-sharp is a whole step higher than C, which is the D key on the piano keyboard. E double-flat is a whole step lower than E. ... C double-sharp, E double-flat and D are enharmonic equivalent or enharmonic notes.
Why are there double sharps and double flats?
The purpose of double sharps and flats in key signatures is to represent this scale in the way it is written, and avoid constant use of accidentals on a note - as per the example switching between G and G#.
Are there double sharps?
A double-sharp is an accidental for a note that has two sharps, meaning the original note is raised by two half-steps (also called semitones). The double-sharp symbol resembles a bold letter "x" and is placed before a notehead, similar to other accidentals.
Are there double flats?
A double-flat is the equivalent of two flats, and lowers a note's pitch by two half steps. The double-flat symbol (♭♭) is placed before a note like other accidentals.
