Greatest Hits: Decade #1 is the first greatest hits album by American singer Carrie Underwood, released on December 9, 2014, by Arista Nashville. A two-disc set, the release contains material from Underwood's first four studio albums: Some Hearts (2005), Carnival Ride (2007), Play On (2009) and Blown Away (2012). Two newly recorded songs were included: "Something in the Water" and "Little Toy Guns". The album also contains four additional tracks.