From her bio:
Tona Brown is an African American Transgender violinist and vocalist who has had a career spanning both North America and Europe. Her destiny as a performance artist was etched in stone at an early age. She started playing the violin at the age of 10 years old. She has won scholarships and competitions since the age of 14.
According to her Facebook page, the video of her performance should be available soon. In the meantime, here she is singing the National Anthem at the Department of Veterans Affairs last year:
Note: This post originally stated that Ms. Brown sang at the White House LGBT Pride Reception. This was my error. I misinterpreted an email that I had received about the event. My apologies to Ms. Brown.