Carrie Underwood celebrates her first No. 1 on The Billboard 200 and her second chart-topper on Top Country Albums as her sophomore effort "Carnival Ride" debuts with 527,000 ... The unique pairing of Robert Plant and Alison Krauss yields a No. 2 debut on both The Billboard 200 and Top Country Albums ... The big chart also welcomes high debuts from Gary Allan, Serj Tankian, Coheed and Cambria, Seether, Neil Young and Juanes ... In Progress Reports, we've got updates on Taylor Swift, Timbaland and Radiohead.