Mann, songs such as "Let's Twist Again", "Bristol Stomp", "Mashed Potato Time", and "South Street". These were the years of the twist and other dance crazes, in the launching of which Appell played a vital role. Appell left Cameo in 1964. In the 1970s he had success with his productions for Tony Orlando and Dawn, including the # 1 hits "Knock Three Times" (1970) and "Tie a Yellow Ribbon Round the Ole Oak Tree" (1973), on Bell Records in New York City. Appell's co-producer at the time was Hank Medress, a founding member of The Tokens musical group. Appell died on November 18, 2014. Cause of death is unknown. He was survived by his children Roz (Robert Purdy) Appell Purdy, Lynda Appell and granddaughter Sara Millett. References External links 1922 births 2014 deaths United States Navy sailors Record producers from Pennsylvania Songwriters from Pennsylvania American publishers (people) American audio engineers American rock guitarists American male guitarists American male singers American session musicians Central High School (Philadelphia) alumni United States Navy personnel of World War II Place of death missing Singers from Pennsylvania Guitarists from Philadelphia 20th-century American guitarists Engineers from Pennsylvania 20th-century American male musicians American male songwriters