Database: hockey
Question: Please list the first names of the coaches who have taught the Montreal Canadiens.
SQL: SELECT DISTINCT T3.firstName FROM Coaches AS T1 INNER JOIN Teams AS T2 ON T1.year = T2.year AND T1.tmID = T2.tmID INNER JOIN Master AS T3 ON T1.coachID = T3.coachID WHERE T2.name = 'Montreal Canadiens'