Every now and then you "discover" a new song or singer, in this case it was both. I can't remember how but I clicked a link somewhere and ended up on Youtube where I found a video titled The Mists of Islay by Hayley Westenra. When I heard the song for the first time I immediately liked it and she reminds me in a way of Loreena Mckennitt, another Celtic singer with a great voice. You can find the lyrics of her song here.
About Hayley Dee Westenra: "born on 10 April 1987, Hayley Westenra is a New Zealand soprano, songwriter and UNICEF Ambassador. Her first internationally released album, Pure, reached #1 on the UK classical charts in 2003 and has sold more than two million copies worldwide. Pure is the fastest-selling international dÃ©but classical album to date, having made Westenra an international star at age 16. In August 2006, she joined the Irish group Celtic Woman, was featured on their Celtic Woman: A New Journey CD and DVD, toured with them on their 2007 Spring Tour, and also was featured on their latest DVD, The Greatest Journey: Essential Collection, released in 2008. She sings songs in a number of languages, including English, Maori, Chinese, Italian, Irish, German, Japanese, Welsh, and Latin." More information on Hayley is available on her official website.