HART magazine and Q-O2, a Brussels-based space for experimental music and sound art, join forces with 21 Tracks for the 21st Century, a series of playlists to gear ourselves for our present century. We ask our guests: what music does this century need? As tonic, as engine-fuel, as rhythm, as common ground, as ballast? Each time, we invite one artist, thinker or musician to prepare a playlist of those sounds, songs and pieces of music that will best arm their listeners with the tools to approach what is left of this young century. For this edition, we've invited Brussels-based duo RHH.