Sonia Lee is from Detroit, Michigan. She was only a teenager when she performed at Carnegie Hall. She then went on to debut with the Buffalo Philharmonic Orchestra and entered Juilliard. Sonia then became the youngest principal violinist with the Toronto Symphony at age 21. She then went on to perform with the Three Tenors, Joni Mitchell, Billy Joel, Chantal Kreviazuk, Rod Stewart, Brian Wilson, Diana Ross, Chris Botti, Raine Maida, Paul McCartney, and many more. 
Sonia Lee's audition in Episode 103 was never televised. It is unknown whether or not she was buzzed, but at least two judges voted "Yes," sending Sonia to the Semifinals.
Sonia has also recently won accolades for her film scores-Her soundtrack for the film 'RAISED ALONE' was honored with the Best Film Score award at the 2010 Detroit Film Awards directed by Sam Kadi.