Chris Martin of Coldplay performed a cover of Taylor Swift's 'Love Story' at a concert in Vienna after Swift had to cancel her own shows due to a terror threat linked to ISIS. The cancellation was announced just before her scheduled performances on August 8, prompting concerns for fan safety. Swift expressed her devastation over the situation in a heartfelt Instagram post, stating that her silence was a measure of restraint to avoid provoking potential harm to fans. During the performance, Martin humorously warned the audience not to post the cover online, acknowledging the unique circumstances surrounding the event. He emphasized the kindness and unity of Swift's fans and invited them to join him on stage. Swift later expressed gratitude for the authorities who ensured the safety of the public, reflecting on the precarious situation that led to the concert cancellations.