Melodious

adj.joyful, calmwarm

What it means

Pleasant to hear because of a smooth, musical quality.

Reach for it when praising a voice, call, passage, or sequence of sounds

A melodious whistle drifted from the open workshop door.

everyday
musical
when pleasing variation of pitch is enough
not when Musical can describe ability or structure without saying the sound is pleasant.
everyday
sweet-sounding
when plain description is more useful than a literary adjective
not when Sweet-sounding can feel childish and does not capture complex beauty.
warm
tuneful
when a clear, pleasing tune is easy to follow
not when Tuneful fits music better than speech or natural sounds.
professional
harmonious
when notes or voices combine agreeably
not when A single melodic line can be melodious without any harmony.
formal
euphonious
when harmonious sound combinations are the analytical focus
not when Euphonious is technical and may feel cold for a beloved voice.
formal
pleasing to the ear
when the judgment should be stated without musical jargon
not when This explanatory wording leaves the source of the pleasing sound unnamed.
literary
dulcet
for sweet, soothing tones in elevated prose
not when Dulcet is old-fashioned and can be read as ironic.
literary
lilting
when a light, buoyant rise and fall creates appeal
not when Lilting implies a particular rhythm and can sound overly cheerful.
literary
mellifluous
when richness and smooth flow deserve emphasis
not when Mellifluous is more ornate and can sound affected in simple praise.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.