NASHVILLE - Blake Shelton enjoyed some of the fruits of his success Friday. Before his CMA Music Festival appearance at LP Field, he celebrated two recent No. 1 country hits, Over and Sure Be Cool If You Did. The two singles were Shelton's seventh and eighth consecutive No. 1 hits. He could have his ninth as early as Monday with Boys 'Round Here. Calling Shelton "the greatest artist I've ever had a chance to work with," Warner Music Nashville president, noted that Shelton had sold 6 million tracks, including 2.5 million from his current album, Based on a True Story ... . He also read one of Shelton's texts to the label: "Wow!!!!! Number one album after 10 weeks on the charts?! Good work my men. I can't believe this. Let's all get naked together and do a shot. Wait. Let's just do the shots."