"Today Is Your Day" is a song performed by Canadian singer-songwriter Shania Twain. It was self-penned by Twain and co-produced by the singer alongside David Foster and Nathan Chapman. The song was released on June 12, 2011 by Mercury Nashville Records, as a promotional single to accompany the documentary television series Why Not? with Shania Twain (2011). The song marked Twain's first song release in over six years. Twain wrote the track for self-inspiration, during the development of Why Not? with Shania Twain. To her, "Today Is Your Day" became the theme song for the series, expressing the purpose behind it via music. Despite feeling apprehensive, Twain decided to record the track, which induced her to create her forthcoming fifth studio album. The track is midtempo ballad in the country pop genre. Lyrically, "Today Is Your Day" regards personal upliftment. "Today Is Your Day" is Twain's first piece of music to have had no involvement with now ex-husband Robert John "Mutt" Lange in 18 years. "Today Is Your Day" has received mixed reviews from music critics and mild commercial performance in Canada and the United States. On the Canadian Hot 100, the song peaked at number 16, while, in the US Billboard Hot 100, it peaked at number 66. It became Twain's first effort to enter the main-genre chart since "Party for Two" (2004). Despite not receiving an official music video, a promotional music video was gathered from footage from Why Not? with Shania Twain.