croon Synonyms

sing softly warble vocalize versify tweedle troll trill tremolo song sol-fa singsong sing singing sung serenade sang whir whistle yodel sing low make melody lift up a voice sings scat singing line out cradlesong berceuse belt out bel canto tootle birdsong lullabied soapbox vocalise roar purr coronach coo constate chorus choir chirp chant chanting caroling carol cantillate canary calypso buzz