Double sharp notation - why should i use it?

An accidental symbol (𝄪) placed to the left of a note indicating that the note is to be raised by two half steps (two semitones). The double sharp symbol alters the pitch of the note to which it is attached as well as any subsequent occurrence of the same note (identical line or space) in the same measure.

1. Why would you use a double sharp?
2. Why do we need double sharps and double flats?
3. What is the purpose of double accidentals?
4. What does a double sharp mean in music?

Why would you use a double sharp?

In its essence, the double-sharp is largely used for purposes of adhering to the rules of music theory. For example, a piece of music written in the key of C# Major puts a sharp on every note. Let's say that the composer wanted to write an A natural in a measure that already contains some A#s.

Why do we need 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#.

What is the purpose of double accidentals?

Double accidentals raise or lower the pitch of a note by two semitones, an innovation developed as early as 1615. This applies to the written note, ignoring key signature. An F with a double sharp applied raises it a whole step so it is enharmonically equivalent to a G.

What does a double sharp mean in music?

: a character placed after a note in musical notation that raises its pitch by a whole step.