What are the key of A minor chords and how are they used in music composition?

The key of A minor consists of the chords A minor, B diminished, C major, D minor, E minor, F major, and G major. These chords are used in music composition to create emotional depth and tension, as well as to establish the tonal center of a piece in the key of A minor. They can be combined in various ways to create harmonic progressions that evoke different moods and feelings in the listener.