The skill of performing the groktalica, i.e. rozgalica, potresalica, involves a specific way of singing with a vibrating voice, perceived as a pronounced vibrato. Groktalice are sung monophonically – solo or in a group of several singers of the same sex. A group performance of groktalica involves two soloists, one of whom starts the song, i.e. calls, singing in a recitative style, and the other continues by producing the sound typical of the groktalica, joined by the group members, who usually provide a drone accompaniment. The sound characteristic of the groktalica is marked by a long and protracted syllable OJ. This singing skill is used in the performance of songs sung during the celebration of the slava, weddings, wolf hunting, as well as love and other songs based on decasyllabic rhymed couplets. A special form of this type of singing is a style known as janjsko pevanje, which is always performed by three female singers. What is specific of this style is that the characteristic sound appears in the soloist’s vocal sections.
The groktalica and rozgalica, as part of performing arts and oral traditions, are preserved by the local Serbian communities from Dalmatia (Lika, Kordun, Bosanska Krajina) who settled in Vojvodina in the 20th century (after World War I and II), as well as a significant number of migrants from the Dinaric areas who settled in Vojvodina and Belgrade in the 1990s.