Here's a video of two New York City Ballet dancers, Maria Kowroski and Ask la Cour, performing at sunrise on the 57th floor of 4 World Trade Center earlier this month.
It's called "New Beginnings," it's beautiful, and you should watch it.
The dance is choreographed by Christopher Wheeldon and is called "After The Rain." According to the Youtube description, "It is a testament to the resilience of the human spirit, and a tribute to the future of the city that New York City Ballet calls home."
It might also make you cry: