Country stars were responsible for some big TV ratings on Thursday night. According to Zap2It.com, the episode of CBS' CSI featuring Rascal Flatts won its time slot with 15.6 million viewers, beating out Grey's Anatomy and The Office. The night's top-rated show was FOX's American Idol, featuring a performance from Danny Gokey. That broadcast pulled in 19.3 million viewers and helped propel Danny's album My Best Days to the top of the iTunes Album chart.