Conversation so far:
What popular song was released by Lorde in 2009 ?
CANNOTANSWER.
What did she do in 2009 ?
In 2009 Maclachlan signed her to UMG for development.
Did she go on tour in 2009 ?
Lorde was also part of the Belmont Intermediate School band Extreme.
Did she released album in 2010 ?
In 2010 Lorde and McDonald performed covers live on a regular basis.
What did she do in 2011 ?
In 2011, UMG hired vocal coach Frances Dickinson to give Lorde singing lessons.

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