Continuing her cavalcade of famous guest-performers, Taylor Swift brought out Kanye’s friend Beck and art-pop god St. Vincent to perform Beck’s “Dreams” last night. Out of the melancholic, introspective Morning Phase, Beck was ready to dance and have fun again. St. Vincent, glittering like a dream, ripped into a guitar solo while fireworks erupted around her, as should always be the case. T. Swift, Beck, St. Vincent: sounds almost like a superhero trio, something you might see on a Saturday-morning cartoon block. Someone should make this happen.