Justice League Of America #163 1979

Justice League Of America #163, published in February 1979, presents 'Concert of the Damned.' Green Arrow is ambushed by Anton Allegro, a new musical villain who wields a magical synthesizer to summon demons for revenge. The Justice League attempts to stop him, with Batman and Superman ultimately preventing further tragedy. This issue is notable for the first appearance of Anton Allegro and a key development in Zatanna's personal story, as she discovers her new costume and amnesia are linked to her supposedly deceased mother, Sindella.