Premise: U2 . This experimentation continued through their ninth album , Pop ( 1997 ) , and the PopMart Tour , which were mixed successes . The group 's thirteenth album , Songs of Innocence ( 2014 ) , was released at no cost through the iTunes Store , but received criticism for its automatic placement in users ' music libraries . U2 have released 13 studio albums and are one of the world 's best-selling music artists of all time , having sold more than 170 million records worldwide .
Hypothesis: U2 has released eight studio albums.
Label: CONTRADICTION