If you hear something you like, you can describe the sounds as pleasant, pleasing, enjoyable, rich, vibrant, elegant, appealing, delightful, marvelous, splendid, or exquisite. I hope this is what you're looking for.

A general phrase you could use when something sounds nice is simply to say: "That sound is pleasing to the ears." "It pleases the ears."

A dulcet voice is one that is gentle and pleasant to listen to, Euponious is an adjective that means having a charming, pleasant, harmonious sounds. A melodious sound is referring having a tune that is pleasant to ears. A tuneful sound have a pleasant and catchy tune. I check the dictionary, hope that helps.