Gerrard sings many of her songs, such as "Now We Are Free", "Come Tenderness", "Serenity", "The Valley of the Moon", "Tempest", "Pilgrimage of Lost Children", "Coming Home" and "Sanvean" in idioglossia — although she also sings in English. With respect to such work she has said, "I sing in the language of the Heart. [...] It's an invented language that I've had for a very long time. I believe I started singing in it when I was about 12. Roughly that time. And I believed that I was speaking to God when I sang in that language."