Making her first appearance at the CMA Music Festival in 15 years, Shania Twain signed copies of her autobiography, From This Moment On, Friday (June 10) at Nashville's Bridgestone Arena. Her New York Times bestseller was available for purchase at the event. After appearing Wednesday on the CMT Music Awards, Twain celebrated the worldwide sales of 75 million albums during a private party Thursday afternoon (June 9) at a Nashville club. Twain has made numerous appearances in Nashville this week, including the CMT Music Awards, the CMA Music Festival and a press conference at the Country Music Hall of Fame and Museum. She will release a new single, "Today Is Your Day," on Sunday (June 12) during the season finale of her docu-series, Why Not? With Shania Twain, on the OWN: Oprah Winfrey Network. The track is her first new music in six years. She co-produced it with Nathan Chapman. The song will be released to country radio and iTunes immediately following the OWN program.