Those who have watched them live may say vocalists Elena Friedrich and Lydia Hendrikje Hornung look alike. But it's when they start singing that you notice the difference in the textures of their voice — and how uniquely they blend together to form one unit.

It's these quirky harmonies that the fo­rmer roommates aim to bring to the stage with the launch of their new collaboration Gold, in the city this weekend. Besides having a glam and disco vibe, the name of their project is also a reflection of their friendship. "Our friendship is precious," Elena says.