Double Sharp
Raises a note by two semitones — a whole tone, not two separate sharps
Related
A double sharp is a variant of the sharp sign; it raises a note by two semitones, a whole tone: F double sharp equals G, C double sharp equals D.
It is common in sharp keys and chromatic harmony. The leading note of G♯ minor is F double sharp, and the raised fifth of D♯ major is A double sharp. Double sharps keep labels such as leading note or raised fifth readable instead of switching to another letter.
Do not see two separate sharps. It is one sign, one whole-tone rise, valid at that pitch for the rest of the bar. F double sharp and G share a key but not a function; respelling as G erases the leading-note tendency.
Sources
- 重升号的含义与用法，参 The New Grove Dictionary of Music and Musicians, "Accidental"；本文为原创表述
Used for fact-checking only; all prose is original.