Dave Appel was an influential American musician, arranger, and record producer in the mid-20th century, best known for his work with the Applejacks and Cameo-Parkway Records. His musical style broadly encompassed rock and roll with an emphasis on the dance-oriented "Philadelphia Sound". Appel's work significantly contributed to the development of the dance craze in the 1960s, with notable hits including "The Twist". His influence on the music industry, particularly within the genre of rock and roll, is still recognized today.