maestro
Used for a distinguished conductor, composer, or music teacher, especially in classical music contexts. Carries a respectful, somewhat formal tone.
from Italian
今夜のコンサートは世界的なマエストロが指揮を執る。
A world-renowned maestro will conduct tonight's concert.
The orchestra members respectfully address him as 'maestro'.
He is world-renowned as a maestro of opera conducting.