Eleanora Fagan (April 7, 1915 – July 17, 1959), professionally known as Billie Holiday, was an American jazz musician and singer-songwriter with a career spanning nearly thirty years. Nicknamed "Lady Day" by her friend and music partner Lester Young, Holiday had a seminal influence on jazz music and pop singing. Her vocal style, strongly inspired by jazz instrumentalists, pioneered a new way of manipulating phrasing and tempo. Holiday was known for her vocal delivery and improvisational skills, which made up for her limited range and lack of formal music education. While there were other jazz singers with equal talent, Billie Holiday had a voice that captured the attention of her audience.

After a turbulent childhood, Holiday began singing in nightclubs around Harlem. After being heard by producer John Hammond, who commended her voice, Holiday was signed to Brunswick Records in 1935. Collaborations with Teddy Wilson yielded the hit "What a Little Moonlight Can Do", which would later become a jazz standard. Throughout the 1930s and 1940s, Holiday booked mainstream success with labels such as Columbia Records and Decca Records. By the late 1940s, however, Holiday was beset with legal troubles and drug abuse. After a short prison sentence, Holiday performed a sold-out concert at Carnegie Hall. However, due to her drug and alcohol problems, her reputation deteriorated.