“Iconoclasts Tour” arrives at Elsewhere in Brooklyn with Swedish composer and singer Anna von Hausswolff, working in the borderland between rock songcraft and liturgical-scale sound. The set draws on her organ-driven language and slow-building arrangements, staged in a room better known for club energy than concert hush. In New York, where experimental pop and downtown minimalism have long overlapped, her approach reads as part of that lineage rather than a genre detour. One clear effect is how she treats volume and repetition as structure, not decoration.