Country singer and coach on "The Voice" Blake Shelton is set to score his 11th career Number 1 single on Billboard's country songs chart, as his "Drink It In" single rises to the top spot from No. 2 this week.  Interestingly, "Drink It In" will reach the chart's apex on the 11th anniversary of the day his first No. 1 "Austin" reached the chart's summit.