Conversation so far:
What popular song was released by Lorde in 2009 ?
What did Lorde do in 2009 ?
In May 2009, Lorde and her friend Louis McDonald won the Belmont Intermediate School annual talent show as a duo.
Did Lorde go on tour in 2009 ?
Did Lorde release an album in 2010 ?
Lorde's debut studio album Pure Heroine containing the single Royals was released in September 2013.
What did Lorde do in 2011 ?
In 2011, UMG hired vocal coach Frances Dickinson to give Lorde singing lessons twice a week for a year.

Question: Why did she need a vocal coach ?
Self-contained rewrite: Why did Lorde need a vocal coach ?