Seattle’s Macklemore and Ryan Lewis, who have owned the top of the Australian singles chart with ‘Thrift Shop’ for the past month, are just one of the acts added to SXSW 2013. Here is the list of new acts added to SXSW 2013 today. 100s (Berkeley CA) 360 (Melbourne AUSTRALIA) 3rd Line Butterfly (Seoul SOUTH KOREA) Adam WarRock (Memphis