F♯ (F-sharp) — musical pitch, notation, and musical uses

Notation and names

Anglo-American notation typically uses the symbol F#; in many Romance languages the name corresponds to local solfège syllables (for example fi in movable-do solfège). The sharp sign (♯) modifies the letter name. To learn about the sign itself see eff-sharp. In written music, accidentals, key signatures and clef placement determine how F♯ appears on the staff.

Pitch relations and temperament

F♯ lies one semitone above F and one semitone below G; it is therefore enharmonic to G♭ in equal temperament but not necessarily identical in older tuning systems. Historical temperaments such as meantone or Pythagorean tuning can give F♯ a different pitch quality than G♭. The concept of a semitone and its chromatic/diatonic roles is important for understanding these differences; see semitone.

Scales, keys and common usages

• F♯ major key signature: six sharps (F♯ major is often used in orchestral and piano repertoire).
• F♯ minor: its relative major is A major; F♯ minor appears in natural, harmonic and melodic forms depending on context.
• Common scale forms: F♯ major, F♯ natural minor, F♯ harmonic minor, F♯ melodic minor (ascending/descending).

Notation of these scales uses accidentals such as G♯, A♯ and E♯ (the latter being enharmonic with F). Practical considerations, such as ease of reading and instrument transposition, influence choice of key in composition and performance.

Historical and practical notes

In Western music history, choices about whether to label a pitch F♯ or G♭ have been shaped by harmonic function, notation conventions, and tuning systems. Composers and performers consider enharmonic spelling to clarify voice leading and harmonic analysis. On fretted instruments like guitar, keys with many sharps may be shifted with a capo or transposed to simplify fingering; keyboard and electronic instruments can produce F♯ without adjustment.

Significance: F♯ appears across genres from classical to jazz and pop. Its treatment—whether as a raised fourth, leading tone, or tonic—depends on harmonic context, making it a flexible and frequently encountered pitch in tonal and chromatic harmony.