This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A performer upon a cembalo, usually a harpsichord or a pianoforte.

"Before completing his thirteenth year, Ludwig obtained his first official appointment from the Elector; he became what is called cembalist in the orchestra, which meant that he had to play the piano in the orchestra, and conduct the band at rehearsals."