Following World War II, however, laendlermusic quickly grew less popular with the influx of imported styles. The field also grew less diverse, with more standardized band formats and only four or five dance types in the repertoire. By the 1960s, trios consisting of two accordions and a double bass were the most common format, and many Swiss people felt it was a civic duty to preserve this tradition and guard it against change. They have largely succeeded in preventing change, but the field has grown stagnant and much less popular. There are still popular performers, such as Res Schmid, Willi Valotti, Markus Flueckiger, Dani Haeusler, and Carlo Brunner, but the total fanbase has shrunk enormously.