Boggess begins to sing at the 2:57 mark:
The Proms, more formally known as The BBC Proms, or The Henry Wood Promenade Concerts presented by the BBC, is an eight-week summer season of daily orchestral classical music concerts and other events held annually, predominantly in the Royal Albert Hall in London. Founded in 1895, each season currently consists of more than 70 concerts in the Albert Hall, a series of chamber concerts at Cadogan Hall, additional Proms in the Park events across the United Kingdom on the last night, and associated educational and children's events. In 2009 the total number of concerts reached 100 for the first time. In the context of classical music festivals, Jiří Bělohlávek has described the Proms as "the world's largest and most democratic musical festival".
http://en.wikipedia.org/...
The Proms seem to favor Sierra Boggess. Here's what I found:
Sierra Boggess made her Broadway debut in The Little Mermaid, then returned to Broadway as an opera student in Master Class. She has played Andrew Lloyd Webber’s heroine Christine Daae in the Las Vegas and Broadway productions of The Phantom of the Opera and in the West End premiere of the hit musical’s sequel, Love Never Dies.
http://www.broadway.com/...
A bit more from Wiki, although
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snip
Sierra Boggess (born May 20, 1982) is an American theater actress and singer....
She originated the role of Ariel in the 2007 The Little Mermaid[2] She also starred opposite Kristin Chenoweth in the Encores! production of Music in the Air.[3] Boggess played her final performance as Ariel on May 31, 2009.[4]
From February 2010 to March 2011 Boggess starred as Christine Daaé in the sequel to The Phantom of the Opera, Love Never Dies.[5] She also took part in The Rodgers and Hammerstein Prom at The Royal Albert Hall on 22 August 2010 which was screened on 28th.[6]
Boggess recently starred as Sharon, alongside Tyne Daly, in the Broadway revival of Master Class.[7] The show concluded its limited engagement on September 4, 2011.
http://en.wikipedia.org/...
One of my favorite of her clips -- one that really shows how great her voice is: