Amaguan

This is a quasi-language built around the ability to create tones and inflections that are pleasing to the ear. It has some words of its own, but relies largely on being built around an established area. Used by bards and those who ply ears for a living, Amaguan also includes the ability to create sounds and accents that will cause the listener to be drawn to the speaker. Nothing as powerful as charm magic, but it sometimes referred to as the language of love.

Amaguan is included in the Gether Guide to Languages on DrivethruRPG:
https://www.drivethrurpg.com/product/328473/Gether-Guide-To-Languages