2013 Grand National to modifications made for the previous year's race, Aintree announced that a number of further changes had been made for the 2013 National. Twelve of the 16 fences on the course were rebuilt with the timber frames within them replaced by a softer material known as "plastic birch". The fences are still covered with at least 14 inches of spruce and will remain the same height. The starting line was also moved 90 yards closer to the first fence, further away from the spectators' stands and thereby reducing slightly the overall distance. Aintree and the Professional Jockeys' Association jointly issued
The Times They Are a-Changin' (song) which was moderately successful. In addition to its appearance on the Byrds' second album, "The Times They Are a-Changin" is included on several Byrds compilations, including "The Byrds' Greatest Hits Volume II", "The Very Best of The Byrds", "The Byrds", "The Essential Byrds", "There Is a Season", and "The Byrds Play Dylan". In January 1984, a young Steve Jobs recited the second verse of "The Times They Are a-Changin'" in his opening of the 1984 Apple shareholders meeting, where he famously unveiled the Macintosh computer for the first time. In 1994, "The Times They Are a-Changin'" was licensed for use