croon in German
croon in German
säuseln
(transitive, intransitive) to hum or sing (a song or tune) softly in a low pitch or in a sentimental manner; to sing (a popular song) in a low, mellow voice
summen
(transitive, intransitive) to hum or sing (a song or tune) softly in a low pitch or in a sentimental manner; to sing (a popular song) in a low, mellow voice