Not very related but me and some folks sometimes consciously make an effort to pick songs more/everyone would know (e.g. if its a an all weeb karaoke stuff like Digimon, Only My Railgun; if a normie karaoke then something everyone might know like Bon Jovi. And YES I sang bon jovi at a japanese company karaoke before, they love the oldies stuff) to help set the atmosphere. But if everyone knows each other or the atmosphere doesnt need help then I just sing whatever I want, since I can sing in 3 languages.
