Related Information Rock music emerged during the mid 1950s to become the major popular musical form of young audience in the United States and Western Europe Its stylistic scope is too broad to be encompassed by any single definition the only feature common to all rock music is a heavy emphasis on the beatRelated Information Rock music emerged during the mid- 1950s to become the major popular musical form of young audience in the United States and Western Europe. Its stylistic scope is too broad to be encompassed by any single definition; the only feature common to all rock music is a heavy emphasis on the beat