Bing Crosby was an American singer and actor who was one of the best-selling recording artists of the 20th century, with his warm bass-baritone voice becoming a signature sound. His style was characterized by a casual, relaxed approach, and he was often cited as a major influence on the development of the "crooner" style. Crosby's recording of Irving Berlin's "White Christmas" is recognized as the best-selling single of all time. His significant contributions to music and film solidified his status as a pivotal figure in the popularization of mid-century music.