A-flat Major is a musical key that consists of four flats in its key signature: B-flat, E-flat, A-flat, and D-flat. It is often associated with a warm and rich sound, making it popular in various musical genres, including classical, jazz, and pop. The A-flat Major scale includes the notes A-flat, B-flat, C, D-flat, E-flat, F, and G. In terms of harmony, A-flat Major is frequently used in compositions for piano and orchestral works. Famous pieces in this key include Beethoven's "Piano Sonata No. 31" and Brahms' "Symphony No. 3." The key is also notable for its use in jazz standards, providing a lush backdrop for improvisation.