A Great Big World singer Chad King explains his decision to stop performing due to MS and helping others "feel less alone"

A Great Big World, the Grammy-winning musical duo of Chad King and Ian Axel, is entering a new chapter as King steps back from performing due to a multiple sclerosis diagnosis while releasing their new EP "Then There Were Sparks."

King, who was diagnosed with multiple sclerosis in 2007, made the difficult decision to stop performing after years of resistance. 

"I've been singing and performing since I was like seven, so the idea that I wouldn't be able to do that didn't make sense to me," King said during a "CBS Mornings" interview. "For the last few years, he's been trying to say, 'Chad, there are things going on with your body that you should be aware of.' And I wouldn't admit to it. I was telling him everything is fine."