Universal key fractions (e.g. an A natural in the scale above becomes ) or, more commonly in written text, by inserting an accidental before the number (e.g. the same note becomes 5 or 4). In music theory aimed towards jazz and popular music, all triads are represented by upper case numerals, followed by a symbol to indicate if it is not a major chord (e.g. "m" for minor or "ø" for half-diminished): When representing the triads rooted in a minor key, accidentals are used to indicate the chromatic alteration from the assumed major key roots indicated by numerals that don't have accidentals:
F (musical note) the key signature, in order to represent a diatonic, rather than a chromatic semitone; writing an F with a following F is regarded as a chromatic alteration of one scale degree (E and F do not sound the same, except in some tunings that define the notes in that way). F (musical note) F is a musical note, the fourth above C. It is also known as fa in fixed-do solfège. It has enharmonic equivalents of E and G, amongst others. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of