Which bandmates are performing in the song "Der Kapitan"? Show the first name and last name.
select t2.firstname, t2.lastname from performance as t1 join band as t2 on t1.bandmate = t2.id join songs as t3 on t3.songid = t1.songid where t3.title = "Der Kapitan"
Who plays in the back stage position? Show first and last names.
select t2.firstname, t2.lastname from performance as t1 join band as t2 on t1.bandmate = t2.id join songs as t3 on t3.songid = t1.songid where t3.title = "Der Kapitan" and t1.stageposition = "back"