Greek goes (sorcerer) relates to goao, to wail, groan: goeteia as the art of the keening conjurer. Plato already uses it pejoratively; late antique and medieval demonology kept the label, and the Lesser Key of Solomon's first book, the Ars Goetia, catalogs seventy-two spirits under it.
The Ars Goetia's afterlife: seventy-two named demons with seals, ranks, and specialties, now the most merchandised demon list in existence, video-game rosters, metal albums, tattoo portfolios. The wailing sorcerer would not recognize his client base.
The wail root suggests sorcery's origin in sound: the keening, the chant, the vibrated name. Goetia may remember when all ritual was acoustic, the spirit summoned by the noise, and every whispered incantation since is a descendant of the howl.
Is some magic evil, or is 'evil magic' just the other class's magic?