The 1960s and 1970s were a time of great change on PLU's campus when restrictions on student life began to loosen. Chapel was no longer required and two dormitories become coed. Girls' dormitories' restrictive hours were replaced with a card-key system, and opposite-sex visitation was allowed 3 times a week instead of 2 times a year. Dancing was allowed for the first time on campus in 1963. Several well known entertainers performed at PLU including Louis Armstrong, Ray Charles, The Steve Miller Band, The Righteous Brothers, B.B. King, Ike & Tina Turner, and Bob Hope.