Zac Brown Band's John Driskell Hopkins on his battle with ALS and "responsibility" after diagnosis

John Driskell Hopkins sings and plays guitar for the Zac Brown Band — enjoying center stage this summer while on tour with one of the top bands in country music. 

But behind the scenes, Hopkins has been battling ALS. He started noticing difficulties playing music back in 2019 and was diagnosed last year, just before Christmas.

Hopkins recalled to CBS News the day he found out the news.