croon Synonyms

sing softly warble vocalize versify troll trill tremolo song sol-fa singsong sing singing sung serenade whir whistle yodel sing low make melody lift up a voice sings scat singing line out cradlesong berceuse belt out birdsong lullabied soapbox vocalise sang roar dirge descant crooning chorus choir chirp chant chanting caroling carol cantillate canary buzz doxologize drone hummed purr psalm