Metta in Pali means loving-kindness. Metta chanting is the radiation of loving and kindness towards all beings: May they all be happy and peaceful. The angelic voice of Imee Ooi chants in Pali beautifully. Metta chanting is soothing, uplifting, joyful and a great healing for the world - pervading it with waves of love.
Reference:
https://en.wikipedia.org/wiki/Metta_Sutta
https://dhammawiki.com/index.php/Chant_of_Metta
https://en.wikipedia.org/wiki/Imee_Ooi