With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Backstreet Boys don't sing.
text_B: The Backstreet Boys -LRB- often abbreviated as BSB -RRB- are an American vocal group , formed in Orlando , Florida in 1993 .. vocal group. vocal group. Backstreet Boys. Backstreet Boys ( 1996 album ). The group consists of AJ McLean , Howie D. , Nick Carter , Kevin Richardson , and Brian Littrell .. AJ McLean. AJ McLean. Nick Carter. Nick Carter ( musician ). Kevin Richardson. Kevin Richardson ( musician ). Brian Littrell. Brian Littrell. The group rose to fame with their debut international album , Backstreet Boys -LRB- 1996 -RRB- .. Backstreet Boys. Backstreet Boys ( 1996 album ). In the following year they released their second international album Backstreet 's Back -LRB- 1997 -RRB- , and their U.S. debut album which continued the group 's success worldwide .. their U.S. debut album. Backstreet Boys ( 1997 album ). They rose to superstardom with their third studio album Millennium -LRB- 1999 -RRB- and its follow-up album , Black & Blue -LRB- 2000 -RRB- .. Millennium. Millennium ( Backstreet Boys album ). Black & Blue. Black & Blue ( Backstreet Boys album ). After a two-year hiatus , they regrouped and released a comeback album Never Gone -LRB- 2005 -RRB- .. Never Gone. Never Gone. After the conclusion of the Never Gone Tour in 2006 , Richardson left the group to pursue other interests .. Never Gone. Never Gone. Never Gone Tour. Never Gone Tour. The group then released two albums as a quartet  : Unbreakable -LRB- 2007 -RRB- and This Is Us -LRB- 2009 -RRB- .. Unbreakable. Unbreakable ( Backstreet Boys album ). This Is Us. This Is Us ( Backstreet Boys album ). In 2012 , the group announced that Richardson had rejoined them permanently .. In the following year they celebrated their 20th anniversary and released their first independent album , In a World Like This -LRB- 2013 -RRB- .. In a World Like This. In a World Like This. The group also released their first documentary movie , titled Backstreet Boys  : Show 'Em What You 're Made Of in January 2015 .. Backstreet Boys. Backstreet Boys ( 1996 album ). The Backstreet Boys have sold over 130 million records worldwide , making them the best-selling boy band in history , and one of the world 's best-selling music artists .. Backstreet Boys. Backstreet Boys ( 1996 album ). best-selling boy band. boy band#Best-selling boy bands. best-selling music artists. List of best-selling music artists#120 million to 149 million records. boy band. boy band. They are the first group since Sade to have their first nine albums reach the top 10 on the Billboard 200 , and the only boy band to do so .. Sade. Sade ( band ). boy band. boy band. They also received a star on the Hollywood Walk of Fame on April 22 , 2013 .. Hollywood Walk of Fame. Hollywood Walk of Fame
related.