Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Performance ( bandmate VARCHAR, SongId VARCHAR, StagePosition VARCHAR )
TABLE: CREATE TABLE Songs ( SongId VARCHAR, Title VARCHAR )
TABLE: CREATE TABLE Band ( firstname VARCHAR, lastname VARCHAR, id VARCHAR )

### Question ###
Who is performing in the back stage position for the song 'Der Kapitan'? Show the first name and last name.

### Accurate SQL ###

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"