Claim: The Beatles was an a cappella group.
Evidence: The Beatles were an English rock band formed in Liverpool in 1960.
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.
A cappella -LSB- a kkapˈpɛlla -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.