Eunice Kathleen Waymon, better known by her stage name Nina Simone /?ni?n? s??mo?n/ (February 21, 1933 – April 21, 2003), was an American singer, songwriter, pianist, arranger, and civil rights activist. Although she disliked being categorized, Simone is arguably most associated with her performance of jazz music. Simone originally aspired to become a classical pianist, but her work covers an eclectic variety of musical styles that include classical music, jazz, the blues, soul, folk, R&B, gospel, and pop music. Her vocal style is characterized by intense passion, a loose vibrato, and a slightly androgynous timbre, in part due to her unusually low vocal range which veered between the alto and tenor ranges (occasionally even reaching baritone lows). Also known as The High Priestess of Soul, she paid great attention to the musical expression of emotions. Within one album or concert she could fluctuate between exuberant happiness and tragic melancholy. These fluctuations also characterized her own personality and personal life, worsened by bipolar disorder with which she was diagnosed during the mid-1960s, but was kept secret until 2004 after her death.