I cannot find widely documented, reliable information indicating that "Julian Sommer, Luca‑Dante Spadafora" is an established musical artist or band with a clear public profile. Based on available public knowledge, there are no well‑known, verifiable sources describing their country of origin, musical genres, period of activity, or artistic characteristics. If you can provide additional context—such as solo versus collaborative roles, recordings, performances, or the scene they are associated with—I can produce a concise encyclopedic description drawn from verifiable facts.