Morning Source: John Walker of Music City Roots By Andrea Hinds - April 23, 2020 Morning Source Guest: John Walker of Music City Roots Morning Source with Donna Vissman chats with Executive Producer of Music City Roots John Walker. Morning Source is your Williamson County morning show hosted by Donna Vissman, bringing you news from the area and interviews with community members.Share on FacebookTweet Email Featured Local Savings Featured Local Savings