Conversation so far:
Where was Pierre Monteux first a conductor?
At the age of twelve, Pierre Monteux organised and conducted a small orchestra of Conservatoire students to accompany Cortot in performances of concertos in and around Paris.
Where was Pierre Monteux a conductor for the first time?
At the age of twelve, Pierre Monteux organised and conducted a small orchestra of Conservatoire students to accompany Cortot in performances of concertos in and around Paris.

Question: Does your article ever show Pierre Monteux as a conductor?
Self-contained rewrite: Does your article ever show Pierre Monteux as a conductor?