Double Sharp Question

[joyeux]

I'm working on the first movement of Moonlight Sonata and one note is confusing me. In measure 27 there's a double sharp on F. But since F is sharp, does the double sharp make it a G# or is it double sharp from F natural to G natural?

[chopinlover01]

Accidentals are absolute, not relative. If it's a double sharp next to an F, it's an F double sharp (enharmonic equivalent of G natural). Accidentals will always override the key signature.

[ekolo]

The note would be "G"
F sharp is raised by a semi tone (step)
F double sharp is raised by a whole tone (two semitones)

[brogers70]

Accidentals are absolute, not relative. If it's a double sharp next to an F, it's an F double sharp (enharmonic equivalent of G natural). Accidentals will always override the key signature.

That's true for almost everything a pianist would want to play. In early Baroque music (e.g. Schutz), though, it is not uncommon for accidentals to be relative, e.g. a sharp sign before a B in the key of G minor turns the B into a B natural, rather than a B sharp.

[visitor]

when in doubt analyze the written and implied harmony, this is a good way to spot editorial and print errors in some of the less than perfect editions out there.

[joyeux]

Thank you for your help!!!