Question: What year did an American rock band initially on album-oriented rock charts and later with hit singles written by Kerry Livgren for their 1976 album "Leftoverture", become popular?
Sentence (from "Kansas (band)"): Kansas appeared on the "Billboard" charts for over 200 weeks throughout the 1970s and 1980s and played to sold-out arenas and stadiums throughout North America, Europe and Japan.
Relevant evidence: No