Sugarland, Taylor Swift, Carrie Underwood, Dolly Parton and Rodney Atkins will perform at the Academy of Country Music Awards in Las Vegas, the ACM announced Tuesday (April 15). Sugarland is nominated for top vocal duo, as well as single, song and video for "Stay." Swift is up for top female vocalist, top new female vocalist and album. Underwood is also nominated for female vocalist. Atkins is nominated for top male vocalist, song, video and album of the year. Parton is an eight-time ACM winner. The May 18 awards show will air live on CBS.