and thus , wrapped in the harmonious solace of his own music , his face often took on a gentle , almost angelic demeanor as a pure and loving smile spread across it ; his nature when performing had a soothing sweetness to it , so much so that it was the delight of children and of honeymooning couples , who all marveled at the sight of him playing and dancing along the riverside streets at dusk , infusing the warm air around him with such verve and joie de vivre .