noun
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.
指揮者 is the general Japanese word for 'conductor', while マエストロ specifically implies a master conductor with high artistic status, often used as an honorific title.
Borrowed from Italian 'maestro', meaning master or teacher, especially in music.