I have been to weddings of close family members of some major Roshei Yeshivas. When some of the songs that I mentioned before came on from the band, not only did the Roshei Yeshivas not protest, they danced to the music of the songs that were mentioned before.
Either they did not know they came from Non jewish music (Which I doubt because many people know the sources of these songs and someone must have told them at some point) or they hold its Halachically OK