adjective
dulcet
DUL-sit/ˈdʌlsɪt/
Sweet or soothing to hear.
The harp's dulcet tones bring a contented smile to the listener's face.

Etymology
A diminutive of “sweet,” this word applies the language of pleasant taste to sound. A dulcet voice is sweet to the ear: soft, pleasing, and melodious.
In context
scarce had the little birds of painted plumage attuned their notes to hail with dulcet and mellifluous harmony the coming of the rosy Dawn
More examples
- The flute's dulcet tones drift through the open window.
- He speaks in dulcet tones to calm the frightened child.
- We wake to the dulcet sound of birds outside.
Forms
dulcet
Similar words
- melodious
- Emphasizes tuneful musical qualities rather than a generally soothing sound.
- mellifluous
- Emphasizes smooth, flowing sound, especially in speech or music.