They are popular singing melodies typical of Rovigno (Rovinj) and probably some of them come from ancient spiritual hymns. The word “da nuoto” means “at night” because they were usually sung at nightfall and they have a particular executive characteristic that includes three singers, but even four: the last one has the aim to reinforce and support the third voice singing in unison. Almost every time the tunes are performed  “at leisure” and nearly whispering while two voices use the high register (even with falsetto). Beyond the bass (or two basses in unison) which is mainly independent from the other two voices, two independent parts are also used by the means of contrary motion. Intervals are almost of a third but often the two upper voices, using precious grace notes, include also intervals of a fourth, fifth and sixth that produce very open intervals. A pretty complex and intricate texture in terms of harmony. Depending on the singer’s vocal ability it sometimes prevails a quest for sophisticated effects  improvised by the performer during the exhibition.