Kolyo Mamin Kolyo (Кольо мамин Кольо) Lead Vocals: Zulieta Svetlanova & Rosica Deleva Accompaniment: (e.g., Formation "Zvezdi" or Petar Yanev)
You can find more performances by Rosica Deleva on the official Formation "Zvezdi" YouTube channel . Oti xolan momche - song and lyrics by Petar Yanev - Spotify kolyo_mamin_kolyo_zulieta_svetlanova_rosica_deleva
Likely a folk singer or musician.