Billie Holiday (born Eleanora Fagan; April 7, 1915 – July 17, 1959) was an American jazz singer and songwriter. She was also called "Lady Day", a nickname that her friend and musical partner Lester Young gave her. Holiday was a very important influence on jazz and pop singing. The way that she sang was similar to the way jazz musicians played their instruments. She was admired for her very personal and intimate way of singing. Critic John Bush wrote that she "changed the art of American pop vocals forever."