The head musician in an eighteenth century court was called

Kapellmeister

Explanation:

Kappellmesiter is a word with a German origin. It was a term used to refer to or describe the head musician in the Eighteenth century court.

A Kapellmeister is a person who is either in charge of an orchestra or a choir.

A Kapellmeister during the 18th century was in charge of music for people from noble homes or background such as Royalty ( Kings, Queens, Princes, Princesses) , people from wealthy backgrounds.