21 versions

My favourite version is the 16 version:

                            HAYLEY WESTENRA

Hayley Dee Westenra born 10 April 1987 is a New Zealand singer, classical crossover artist,^[ 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 début classical album to date, having made Westenra an international star at age 16. In August 2006, she joined the Irish group Celtic Woman.

I like this version because the melody is relaxed and calm 

and her voice is very beautiful