Virtual concerts rely on digital presence to replace the physical stage. Avatars act as performers, hosts, and audience representations. Their visual form shapes how people perceive music, emotion, and interaction. The choice between 2D and 3D avatars affects realism, cost, scalability, and user engagement. This article explains how 2D and 3D avatars function in virtual concert environments. It compares their technical structure, audience perception, production demands, and use cases. The goal is to help creators, platforms, and event organizers choose the right format for their needs.