At the Chor2Go Warm-Up, led by Katharina Schmerer, the audience is tuned in for the festival weekend. Using the best lines from iconic pop and rock songs, a pulsating sing-along medley is created entirely without lyrics—from “na-na-na” to “oh-oh-oh.” A lively, participatory opening that gets the crowd up to full energy and excited for everything the Bardentreffen has yet to offer.