Blake Shelton has had an undeniably successful career in the world of country music, but he admits his popularity did not reach far beyond it until NBC’s “The Voice” came along and “changed everything” for him. In this week’s Sunday Sitdown, Shelton, who holds the record for having the most consecutive No. 1 hits in country music, talks to Sunday TODAY’s Willie Geist about his early days in pageants, opening his Nashville bar Ole Red, and his relationship with Gwen Stefani.