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) the song, suggesting that "we shouldn't have bothered with that song". Another version of the song, recorded in June, is a bonus track on the 1996 reissue. "Turn! Turn! Turn!" ended up becoming the band's third single, reaching number 1 on the U.S. "Billboard" Hot 100 chart and number 26 on the UK Singles Chart. The Byrds performed the song on the U.S. television program "Hullabaloo", but it failed to make a long-term impact. CBS England issued "The Times They Are a-Changin" as the lead track of an EP, along with "Set You Free This Time", written by Gene Clark,