Gregory Porter possesses a gorgeous baritone and the exuberance of mid-'60s soul-jazz and R&B legends like Bill Withers and Donny Hathaway. In 2013, Porter won a Grammy® for Liquid Spirit. Eric Whitacre supports. We've got some good news. Whether you missed out on tickets or went along and wanna relive the night, you can watch this performance live or on-demand. Check it out on iPhone, iPad or iPod touch, iTunes on your computer or in stunning HD with Apple TV. Visit www.itunes.com/festival for more information. Join the conversation using #itunesfestival.