melodious
me-lo-di-ous
adjective
Producing or having a pleasant, tuneful sound; sweet-sounding and musical.
"The robin's melodious song filled the morning air."
Thesaurus
Synonyms: canorous, songful, honeyed, sweet, mellisonant, lyrical, ariose, cantabile, melodic, songlike, musical, mellifluous
Antonyms: tuneless, unmelodic, unmelodious, unmusical, untuneful