Table schema:
CREATE TABLE table_26267607_2 (pole_position VARCHAR, winning_driver VARCHAR, circuit VARCHAR)

Question: In the circuit Showevent Olympiastadion München, where the winning driver is Bruno Spengler, what is the pole position?
SQL: SELECT pole_position FROM table_26267607_2 WHERE winning_driver = "Bruno Spengler" AND circuit = "Showevent Olympiastadion München"