Rock and Roll is a type of music that emerged as a defined musical style in the Southern United States in the 1950s. It now has two distinct meanings, either traditional rock and roll in the 1950s style, or later rock and even pop music which may be very far from traditional rock and roll.
The forerunner of most modern popular music. A development of rhythm and blues and country and western. Traditionally a four or five piece band of drums, bass and lead guitar and lead singer.
a genre of popular music originating in the 1950s; a blend of Black rhythm-and-blues with White country-and-western; "rock is a generic term for the range of styles that evolved out of rock'n'roll."