The Bistrishki Babi or Grannies of Bistritsa is an authentic folklore group from Bistritsa village located near Sofia. The group was established in 1939 and presents authentic songs from Shopluk Region. The original polyphonic singing has brought worldwide fame to the group Bistrishkite babi. Their singing is unique, very archetypal, preserved from the pre-Christian times. Specialists define it as an unique three-voice polyphony. Today, the group Bistrishkite babi consists of 9 women. In the recent 10 – 15 years, they teach and prepare their granddaughters to transfer them their skills and experience.