Melkor aka Morgoth was pretty damn evil from the beginning

Worth highlighting that "evil" in the broader sense here was originally about disharmony as reality is/was a song/music that all beings joined in on and added to in harmony.

Except Melkor who wanted to go off and write his own music while forming a solo boy band with blackjack and hookers which is why his own brand ended up being edgy, emo grunge in various ways.