Write SQL query to solve given problem: What is the level of the course with the most number of teachers?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.courseLevel FROM course AS T1 INNER JOIN taughtBy AS T2 ON T1.course_id = T2.course_id GROUP BY T2.course_id ORDER BY COUNT(T2.p_id) DESC LIMIT 1