They were sung at prescribed times of the year while performing the appropriate rituals. There are songs of Shrovetide and Lent, Easter swinging songs, and Easter songs called lalavimai. The Advent songs reflect the mood of staidness and reflection. Christmas songs contain vocables such as "kalėda, lėliu kalėda; oi kalėda kalėdzieka", while Advent songs contain vocables such as "leliumoj, aleliuma, aleliuma rūta, aleliuma loda" and others. There are several typical melodic characteristics associated with Christmas ritual songs, such as a narrow range, three-measure phrases, dance rhythms, a controlled slow tempo, and a tonal structure based on phrygian, mixolydian or aeolian tetrachords. Polyphonic St. John's Feast songs are commonly called kupolinės, which include refrains and vocables such as "kupolėle kupolio, kupolio kupolėlio, or kupole rože".