F minor

F minor is a minor scale based on F. The harmonic minor raises the E to E. Its key signature has four flats.
Its relative major is A-flat major, and its parallel major is F major.
F minor is a key that people often link with passion. Some famous pieces in the key of F minor are Beethoven's "Appassionata Sonata", Haydn's Symphony No. 49 in F minor, "La Passione", and Vivaldi's The Four Seasons.
In the Baroque period, music in F minor was usually written with a three-flat key signature. Some modern printings of such music keeps it written that way.
E-sharp minor.
The enharmonic equivalent of F minor is E-sharp minor. It is a minor scale based on the musical note E♯. Its key signature has six sharps and one double sharp.