The Cadillacs were an American rock-and-roll and doo-wop group from Harlem, New York; active from 1953 to 1962. The group was noted for their 1955 hit "Speedo", which was instrumental in attracting Caucasian audiences to African American rock-and-roll performers. Rock and roll (also spelled Rock n Roll, especially in its first decade), also called rock, is a form of popular music, usually featuring vocals (often with vocal harmony), electric guitars and a strong back beat; other instruments, such as the saxophone, are common in some styles. ... Doo-wop is a style of vocal-based rhythm and blues music popular in the mid-1950s to the early 1960s in America. ... This article is about the Harlem neighborhood in New York City. ... 1953 is a common year starting on Thursday. ... 1955 is a common year starting on Saturday. ... Caucasian is originally a geographical term, meaning relative or pertaining to the Caucasus region of Eastern Europe and West Asia. ... African Americans, also known as Afro-Americans or black Americans, are an ethnic group in the United States of America whose ancestors, usually in predominant part, were indigenous to Sub-Saharan and West Africa. ... Rock and roll (also spelled Rock n Roll, especially in its first decade), also called rock, is a form of popular music, usually featuring vocals (often with vocal harmony), electric guitars and a strong back beat; other instruments, such as the saxophone, are common in some styles. ...