“Workers in Song” inverts the current artworld logic of exhibitions augmented by performance programs, and instead positions the live event as the centerpiece and the exhibition its supplement (some of the performance elements, along with a soundtrack, remain on show at WIELS until October 8.) Borrowing their title from a Leonard Cohen song, Belgian composer Billy Bultheel and Welsh artist James Richards staged a collaboration that examines the elasticity of such live events, questioning the relations of appropriated artifacts (poems, films, artworks) to newly constructed material (collaborative videos, sound, banners), of spoken word to music or imagery, and of live performance to pre-recording, thus the very nature of liveness itself. It takes place in an exhibition room sparsely adorned with banners, rudimentary props (folding chairs, desk, piano), and two large screens hanging opposite each other. Four angled bleachers sit the audience “in-the-round.” A reperformance of Ian White’s Ibiza (2010) is the first of a nine-part program that is dense, heady, jarring, tender, anxiety-inducing, and shot through with moments of beauty and pathos. Liveness was central to the late artist and curator White’s thinking: he saw the rehearsed gesture and performer’s presence as a “false promise” of the live, finding liveness …