With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: 4 musicians formed Black Sabbath.
text_B: The 2016 Reading Borough Council election took place on 5 May 2016 to elect members of Reading Borough Council in England .. Reading Borough Council. Reading Borough Council. The election for Police and Crime Commissioner was held on the same day .. Police and Crime Commissioner. England and Wales police and crime commissioner elections, 2016. The Labour Party increased their borough-wide vote by over 7 % and held on to marginal seats in Church , Kentwood and Caversham , the later receiving the highest number of votes recorded for any candidate at this election .. After the election , the composition of the council was  :
not_related.