CMT and iTunes deliver a multi-format world premiere as CMT devotes six straight hours to airing Carrie Underwood’s “So Small” on Thursday (Sept. 20) from 6 a.m. until noon, ET/PT. The video also debuts Thursday morning for free streaming at CMT.com. The television and online event coincides with the music video’s world premiere for purchase at the iTunes Store, which will be the exclusive source to purchase the video throughout its debut week. “So Small” is the first single from Underwood’s second album, Carnival Ride, to be released on Oct. 23. She co-wrote the song with Luke Laird and Hillary Lindsey. The video was directed by Roman White, who won a CMT Music Award for another Underwood video, “Before He Cheats.” This marks their fifth collaboration. The video is expected to be televised 66 times within the six-hour span on CMT.