The live Grammy Nominations Concert took over the Nokia Theatre in LA on Friday night. The annual event combines performances with the exciting announcement of the 2014 Grammy nominees, which this year include Katy Perry, Justin Timberlake, Lorde, Taylor Swift, Robin Thicke, and many more. Robin took the stage with T.I. at the show, where Taylor also sang "I Knew You Were Trouble" in a pretaped performance. Drake was supposed to be in attendance but reportedly had to miss the action due to a scheduling conflict. The Grammys take place in LA on Jan. 26. Click through to see all the performance photos!