Within the parameters of nonprofit performing arts, compensation can be a sticky subject, especially when it comes to those at the top of the pay scale. Fortunately, transparency goes a long way and you have multiple resources for researching current trends.
An article I posted here at ArtsHacker in 2016 is every bit as relevant now as it was then:
If you’re looking for something more readily available and up to date, I recently published a series of articles at Adaptistration.com that examines the compensation trends among orchestra executives, music directors, and concertmasters at more than 65 professional U.S. orchestras.