What effect does a 'double sharp' have on a musical note?

A 'double sharp' raises the pitch of a musical note by two half-steps, which is equivalent to a whole step. This means that if a note, for example, has been notated with a double sharp, the pitch will be raised two semitones above its original pitch. For instance, if you have an F note that is doubled sharp, it will sound like a G note.

This alteration is important in music theory, as it allows composers to express harmonic ideas and modulations effectively within the context of the key signature. The use of a double sharp is often found in complex musical compositions, particularly in scenarios where the music requires precise pitch alterations to achieve harmonic balance or melodic development.

The other choices present concepts that do not correctly describe the function of a double sharp in musical notation.