 Alice in Chains is also noted for the unique vocal harmonies of Staley ( or DuVall ) and Cantrell , which included overlapping passages , dual lead vocals , and trademark harmonies typically separated by a major third . Alyssa Burrows said the band 's distinctive sound " came from Staley 's vocal style and his lyrics dealing with personal struggles and addiction " . Staley 's songs were often considered " dark " , with themes such as drug abuse , depression , and suicide , while Cantrell 's lyrics often dealt with personal relationships . 
 Alice in Chains is also noted for the unique vocal harmonies of Staley ( or DuVall ) and Cantrell , which included overlapping passages , dual lead vocals , and trademark harmonies typically separated by a major third . Alyssa Burrows said the band <a href='null_genetive' title='1'><mark>'s</mark></a>distinctive sound " came from Staley <a href='null_genetive' title='2'><mark>'s</mark></a>vocal style and his lyrics dealing with personal struggles and addiction " . Staley <a href='null_genetive' title='3'><mark>'s</mark></a>songs <a href='uninflect' title='4'><mark>were</mark></a> often considered " dark " , with themes such as drug abuse , depression , and suicide , while Cantrell <a href='null_genetive' title='5'><mark>'s</mark></a>lyrics often dealt with personal relationships . 
Alice in Chains is also noted for da unique vocal harmonies of Staley ( or DuVall ) and Cantrell , which included overlapping passages , dual lead vocals , and trademark harmonies typically separated by a major third . Alyssa Burrows said the band  distinctive sound " came from Staley  vocal style and his lyrics dealing wit personal struggles and addiction " . Staley  songs was often considered " dark " , with themes such as drug abuse , depression , and suicide , while Cantrell  lyrics often dealt with personal relationships .