The term 'The Jezebel of Jazz' refers to the legendary jazz singer Billie Holiday. ODAY is an acronym for her nickname, Lady Day. Billie Holiday was a major influence in jazz music and is considered one of the greatest jazz singers of all time. She was known for her unique vocal style and her ability to convey emotion through her singing. Her career spanned four decades and she was inducted into the Rock and Roll Hall of Fame in 2000.