Sia performed a gorgeous and moving acoustic version of Titanium at Trevor Live 2013, a benefit concert/dinner to raise money and awareness for The Trevor Project.
Founded in 1998 by the creators of the Academy Award®-winning short film TREVOR, The Trevor Project is the leading national organization providing crisis intervention and suicide prevention services to lesbian, gay, bisexual, transgender and questioning (LGBTQ) young people ages 13-24.
http://www.thetrevorproject.org/pages/programs-services
