To give a live music concert without the artist present. Orchestras often travel - but they also often perform music by people who are absent (elsewhere, dead, etc.) Electronic music is well suited to absent concerts. But still an audience may expect or yearn for a kind of liveness. Within the frame of music / concerts, the question may become more clear - If the musician / performer is absent, how can the essence of their skill, playing, aura, or personality be present, beyond the sound of their instrument(s)?