Task: Text to Code
Input (English): Step 1: For each row in Band table, find the corresponding rows in Performance table.
Step 2: find Firstname, Lastname of the results of step 1 whose StagePosition equals Der Kapitan
Output (English): SELECT T1.Firstname , T1.Lastname FROM Band AS T1 JOIN Performance AS T2 ON T1.Id = T2.Bandmate WHERE T2.StagePosition = "Der Kapitan"