Fred Waring and The Pennsylvanians were a popular choral ensemble of the mid-20th century, led by the charismatic conductor Fred Waring. Known for their precision, lively performances, and lush harmonies, they played a significant role in popularizing choral music in the United States. Their unique blend of pop, jazz, and classical music, as well as their innovative use of electronic instruments, made them a staple on radio and television. Their most influential works include the Christmas classic "Twas the Night Before Christmas," which exemplifies their distinctive style.