a type of popular dance music originating in the 1950s, characterized by a heavy beat and simple melodies. Rock and roll was an amalgam of black rhythm and blues and white country music, usually based around a twelve-bar structure and an instrumentation of guitar, double bass, and drums.
摇滚乐(源于20世纪50年代的一种流行舞蹈音乐,其特点为节奏强烈、旋律简单,它把黑人音乐节奏、布鲁斯音乐和白人乡村音乐融为一体,通常由大约12小节组成,用吉他、低音提琴和鼓演奏)。