Gabriel Kahane at Zankel Hall, October 25, 2012
The New York Times, Oct. 29, 2012

The Cee Lo Green song is the one you think it was. It was not listed in the Carnegie Hall program, nor were the lyrics were provided. It says something about Gabriel Kahane that the song felt more lived-in than did its predecessor, a Schumann lied, but I'm not sure precisely what.