Which preposition to use with accompanist

in Occurrences 2%

He's the best accompanist in Chicago.

for Occurrences 1%

"Could he be engaged regularly, as an accompanist for you and so on?

to Occurrences 1%

He had a feeling that Claire, having exhausted the novelties of her position as accompanist to Lily Condor, was beginning to find the affair irksome.

Which preposition to use with  accompanist