Kalotaszeg is a region of Transylvania, a previously Hungarian area, so the population is mostly of Hungarian descent, and very much hold on to their old traditions. The music is part of  the Hungarian Tanchaz repertoire. This version is in bass clef for instruments such as cello, bassoon, baritone horn/tuba...
 
Listen here: https://youtu.be/Q--XQJbbO-M