This video from the USA says about itself:
In the eleventh week of their strike against the DSO, symphony musicians visited three homeless shelters in the city of Detroit to perform Christmas music concerts. The WSWS interviewed musicians and residents about the experience.
Striking members of the Detroit Symphony Orchestra and supporters picketed Detroit Democratic Mayor Dave Bing’s annual state of the city address at Orchestra Hall after city officials refused to change the venue: here.
The orchestras of the Berlin Opera Foundation (Komische Opera, State Opera and German Opera), as well as the Concert Hall Orchestra and the German Theatre Association, have been involved in bitter wage disputes for several months. Some performances have been cancelled due to strike action undertaken by the musicians. Occasionally operas started late, and sometimes they were accompanied only by piano after the interval: here.