I certainly would sing songs from other traditions. I would stick to the universal theme songs..avoiding comedies, parodies, etc. I would scrub the lyrics for any truly awful words and apologize in advance to the audience for anything borderline. I would sing more or less in the current voice and not try to badly mimic Ole Svenson's accent but like someone said, give it a nod perhaps. I would not try to clap too much because it has been said that we do not clap well...probably don't sway well either...but sing the songs certainly and encourage the audience to look up more original renditions...mg