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Frankie Avalon
Francis Thomas Avallone (born September 18, 1940), better known as Frankie Avalon, is an American actor, singer, and former teen idol. He had 31 charting U.S. Billboard singles from 1958 to late 1962, including number one hits, "Venus" and "Why" in 1959.
Avalon started appearing in films in the 1960s and is also well known for his role in the 1970s musical film Grease as Teen Angel, in which he sings "Beauty School Dropout" to Frenchy (played by Didi Conn).
Source: Wikipedia