[1][2] Westenra has sung in English, Māori, Irish, Welsh, Spanish, Italian, German, French, Portuguese, Latin, Japanese, Standard Mandarin Chinese, Catalan, and Taiwanese Hokkien.

[15] On that label, Westenra, who in the meantime was attending Burnside High School,[16] released a self-titled album of show tunes and light classical songs, as well as My Gift to You, a CD of Christmas music.

[17] Pure became the fastest-selling international debut album in the history of the UK classical chart, with 19,068 copies purchased in its first week alone, quickly reached No.

Also in 2004, she began her world tour of New Zealand, Australia, Japan, the UK and the US, performing in a concert in November for Queen Elizabeth II, Prime Minister Tony Blair, Charles, Prince of Wales, Colin Powell, Condoleezza Rice and President George W.

[21] In her autobiography, she remembered feeling more nervous in an audition where she sight read to Andrew Lloyd Webber an unreleased piece that he had written.

On 5 September 2006, Westenra was named as one of the ten outstanding young people in the world by the Junior Chamber International, becoming the first New Zealander so honoured.

[30][31] During this time, Westenra alternated with Méav Ní Mhaolchatha, who had recently returned from maternity leave, to maintain a five-member line-up.

[34] The goal of the petition was compliance with the commitment made by President Bill Clinton in previous years to follow the Kyoto Protocol.

[35] Also in 2007, Westenra's vocals were featured in the soundtracks of the movie Flood and the television series, Jekyll, composed by Debbie Wiseman, in the UK.

In November 2007, Westenra successfully staged a Japan "Treasure" concert tour in Fukuoka, Sapporo, Tokyo, Sendai, Nagoya, Osaka, Yokohama, Hiroshima.

Westenra and Oldfield performed "On My Heart" live on the British ITV daytime TV program The Alan Titchmarsh Show on 18 March 2008.

On 1 October 2008, Westenra recorded solo vocals on the CD Different Voice, composed and conducted by Debbie Wiseman and the Royal Philharmonic Orchestra, with narration by Stephen Fry and lyrics written by Don Black.

[37] On 30 November 2008, Westenra was presented by Elaine Paige with the Variety Club Showbiz Awards 2008 Classical Performer of the Year for raising money to help sick, disabled and disadvantaged children and young people.

[41] On 30 October 2010, Westenra staged a recital at the Shanghai Grand Theatre with international backing musicians in an East Asian concert tour.

[50][51] On 31 October 2011, Westenra was featured on André Rieu's classical music album And the Waltz Goes On with the vocal track "Dreaming of New Zealand".

[53][54][55][56] On 12 March 2012, Westenra attended a reception for celebrating the achievements of inspirational women today the event held by the Duchess of Cornwall to mark Commonwealth Day.

[59][60][61] In April 2013, Westenra staged a Far East tour in Taipei, Tainan, Kaohsiung and performed with Chinese tenor DinYi in Beijing.

[67][68] On 24 August 2003, Westenra performed on the stage with opera tenor José Carreras and Bryn Terfel in front of the capacity crowd of 10,000 people from Faenol Festival in Wales.

[73] On 6 May 2007, Westenra was invited to the Crystal Cathedral as a guest performing "Abide with Me" on the Hour of Power, an American Christian television program.

[74] On 28 July 2007, she starred in Woburn LIVE 2007, where she performed a selection of the music of West Side Story with the other recording artists, including Vittorio Grigolo, from the 2007 release.

[75] On 7 August, Westenra performed solo and duet with Malvina Major at St James's Church, Piccadilly among ChristChurch Cathedral Choir 2008 UK Tour.

[77] On 8 November, Westenra performed at the Festival of Remembrance at the Royal Albert Hall, singing "River of Dreams", duet "Today Won't Come Again", written by Geoff Stevens and Don Black, with English tenor Jonathan Ansell, and accompanied Ansell on Here's to the Heroes, by Black and John Barry, when returning soldiers proceeded into the auditorium.

In December 2009, Westenra performed with Faryl Smith and Camilla Kerslake in a special service for British troops serving in Afghanistan from St Clements Church, London.

[79] On 13 November 2010, Westenra performed for a third time at the Festival of Remembrance, singing "For the Fallen", a poem by Laurence Binyon set to music by Karl Jenkins.

[87][88] On 28 April 2012, Westenra performed with Chinese tenor Din Yi and Nie Jian Hua on the 2nd Beijing International Film Festival symphony concert at Olympic Green accompanying by Royal Philharmonic Orchestra.

[89][90][91] In May 2012, Westenra was featured with Laura Wright and Alfie Boe on the souvenir album Gary Barlow & The Commonwealth Band in celebration of the Diamond Jubilee of Elizabeth II.

[98][99] Hayley performed at the Royal Concert Hall, Glasgow along with the Black Dyke Band as guests of Govan Salvation Army Songsters (choir).

[106] In October, Westenra and tenor Jonathan Ansell took to the streets to sell poppies at Waterloo Station to support the Royal British Legion.

[111] On 22 October, the original Second World War Forces Sweetheart Dame Vera Lynn was joined by Westenra in launching the Poppy Appeal for 2009 with a fundraising goal of £31 million.