At 19, Westenra was one of the most popular singers in the English-speaking world, excepting the United States, and had already sold more than three million records. Her albums are usually a mixture of opera arias, hymns, pop songs, tunes from musical shows and traditional Maori, Australian, and Irish songs and whatnot, but it is not the material that her fans are interested in so much as her voice -- pure, light, and clear with no vibrato, yet well-pitched. She has recorded duets with established classical singers such as Bryn Terfel
, Andrea Bocelli
, and José Carreras
, and has performed widely in symphony orchestra concerts and on a touring bill with the popular traditional group Celtic Woman. Westenra has not entirely wasted her largesse on frivolities, as she is the youngest-ever ambassador to UNICEF and has been on at least two relief missions to Ghana. Westenra has resettled in London, but remains the official mascot to New Zealand's All Blacks rugby team, and routinely sings New Zealand's national anthem at their matches when they are held in England.