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. Compositions in A-Flat Major can evoke feelings of nostalgia and beauty. Many famous pieces have been composed in A-Flat Major, including Beethoven's "Piano Sonata No. 31" and Brahms' "Symphony No. 3." The key is frequently used for its expressive qualities, allowing musicians to convey a wide range of emotions through their performances.