Taylor Swift explains why she isn't performing at the Grammys

The Blank Space singer, who is up for three Grammys, admitted she wants to concentrate on planning her upcoming 1989 world tour, although she will present the award for best new artist to either Iggy Azalea, Sam Smith, Bastille, Brandy Clark or Haim. In a message on her Tumblr, Taylor - who performed All Too Well at last year's ceremony - wrote: "Since my whole life is wrapped up and entangled in the planning of The 1989 World Tour right now, I'm not going to be performing on the Grammys this ye