Katty Perry fans have double the reason to rejoice. After it was announced that the pop star is the latest to join the lineup of performers for the upcoming Grammy Awards, the singer has also teased a new single on her Twitter page. "Why are we all so chained... #" she tweeted along with a clipping of a chained heel. Rumoured to be titled Chained to the Rhythm, the song apparently features Bob Marley’s grandson, Skip Marley, whose new single “Lions” Perry promoted over the weekend. Buzz also suggests that the tune is produced by Perry’s longtime collaborator Max Martin and that Sia co-wrote the track.
