I think that if you play a wedding, you pretty much have to play what the Baal Simcha wants. They know their crowd, and presumably know what they would like.
A simcha is made for the enjoyment of the Baal Simchas and their guests. I see nothing wrong with playing some Russian songs at a wedding of people who come from Russia, or Hungarian for people who come from Hungary.
People like what they grow up with. As long as you don’t play inappropriate songs, like Never on a Sunday, at a wedding.
But PLEASE keep the volume at a bearable level, so we don’t go home deaf. I have gone home from quite a few weddings before the main course, because the noise was unbearable. That is not a Simcha, it is torture.