Keith Urban notches his first No. 1 on the Billboard 200 with "Defying Gravity," which sold 171,000 copies in its first week. The set just beats out runner-up Prince, who debuts at No. 2 with 168,000 for his Target-exclusive "LotusFlow3r" album . . . Also starting in the top 10 this week: Diana Krall, UGK and Flo Rida . . . In other news, we've got updates on George Strait's latest No. 1 single, the rise of Seether and MGMT on the Modern Rock radio airplay chart and Pink's trio of No. 1s on the Adult Top 40 radio chart.
