The Beatles was an a cappella group.
The Beatles were an English rock band formed in Liverpool in 1960 .	Liverpool	Liverpool	rock	Rock music	The Beatles	The Beatles (album)
Musically , rock has centered on the electric guitar , usually as part of a rock group with electric bass and drums and one or more singers .	drums	drum kit	electric guitar	electric guitar	rock group	rock group	electric bass	electric bass
A cappella -LSB- a kkapplla -RSB- -LRB- Italian for `` in the manner of the chapel '' -RRB- music is specifically group or solo singing without instrumental accompaniment , or a piece intended to be performed in this way .	instrumental	Musical instrument	accompaniment	accompaniment
