G# / Ab

G#/Ab is most commonly written as Ab in key signatures. Ab major has four flats and a warm, mellow tonality that makes it a favorite in romantic ballads, R&B, and soul music.

Ab major was a favorite key of Chopin, Schubert, and other Romantic-era composers for its velvety warmth. In popular music, Ab is common in soul and R&B — Stevie Wonder and Marvin Gaye frequently wrote in this key.