Blake Shelton possesses a warm, masculine ease that gives his rowdier numbers a sense of sly humor, but this relaxed touch also makes him an effective crooner of ballads, the ace in the hole that has helped him cross over from country to the mainstream and into superstardom. His transition to household-name status was certainly assisted by his starring role as a judge on NBC's hit musical competition The Voice, but by that point Shelton had racked up plenty of number one country hits, beginning with his 2001 debut "Austin" and running through "Some Beach," "Home," "Doin' What ...