Doris Day was an American singer and actress who gained prominence in the mid-20th century. Known for her warm and clear mezzo-soprano voice, she was widely regarded as a versatile artist, equally adept at pop standards, ballads, and jazz. Day's career was marked by hits like "Sentimental Journey" and "Que Sera, Sera," which showcased her signature easy-listening style. As one of the top-charting female vocalists of her era, she significantly influenced the post-World War II pop music scene.