When it comes to describing something as "agreeable-sounding," there are plenty of synonyms to choose from. Some options include pleasant, melodic, harmonious, sweet-sounding, soothing, and dulcet. Another possibility is mellifluous, which specifically refers to a voice or sound that is smooth and enjoyable to listen to. Other synonyms that capture the idea of something that is pleasing to the ear include euphonic, harmonizing, and tuneful. Ultimately, the choice of synonym will depend on the context of the situation and the specific qualities that are being emphasized. Whether describing music, speech, or any other auditory experience, there are many ways to capture the idea of something that sounds agreeable.