James Arthur sings his number one single 'Impossible' at the Summertime Ball 2013. This image appears in the gallery:The Summertime Ball 2013 Highlights - Pictures 63. James Arthur sings his number one single 'Impossible' at the Summertime Ball 2013. Picture: Danny North 122 images See the full gallery: The Summertime Ball 2013 Highlights - Pictures