Hanneman writes both words and music for Slayer . Some of his songs include : `` Raining Blood '' , `` War Ensemble '' , `` Seasons in the Abyss '' and `` Angel of Death . '' Hanneman has contributed both lyrical and musical material to every Slayer album and wrote the songs `` Raining Blood '' , `` War Ensemble '' `` South of Heaven '' `` Seasons in the Abyss '' and `` Angel of Death '' , which are played at almost every live Slayer show .