With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Beatles was an a cappella group.
text_B: 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 .. instrumental. Musical instrument. accompaniment. accompaniment. It contrasts with cantata , which is usually accompanied singing .. cantata. cantata. The term `` a cappella '' was originally intended to differentiate between Renaissance polyphony and Baroque concertato style .. Renaissance. Renaissance music. polyphony. polyphony. Baroque. Baroque ( music ). concertato. concertato. In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music .. Renaissance. Renaissance music. polyphony. polyphony. The term is also used , albeit rarely , as a synonym for alla breve .. alla breve. alla breve
related.