After watching some videos on YOUTUBE, are you talking about what they said before the Blue Danube? It seems to be Ich wünsche Ihnen (said by the conductor) and frhliches Neujahr (said by the players)! I wish you a happy New Year! But whether they used the word frhliches, I'm not sure, I can't hear you clearly. Maybe it's because many of them can't speak German. The word frhliches is not standard, and it may be another word. But it must be a New Year greeting.