Question: Which vocal type did the musician with last name "Heilo" played in the song with title "Der Kapitan"?
Schema: create table band (id varchar, lastname varchar, PRIMARY KEY (id)); create table vocals (songid varchar, bandmate varchar, PRIMARY KEY (songid)); create table songs (songid varchar, title varchar, PRIMARY KEY (songid))
SQL: select type from vocals as t1 join songs as t2 on t1.songid = t2.songid join band as t3 on t1.bandmate = t3.id where t3.lastname = "heilo" and t2.title = "der kapitan"