Three intensity layers per level, and you can actually hear the composition evolve as the threat level climbs. Songs From Beyond is DLC-tier Serious Sam music that keeps the series' dynamic soundtrack formula but leans more atmospheric than the base games.
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"Dead Valley" goes from ambient desert hum at Peace to full-on industrial metal chaos at Heavy, with Indoors splitting the difference in this claustrophobic way. "Mysteries of Ptah" treats its three tiers like movements of the same piece.
The Grand Obelisk's Peace variant is genuinely beautiful in a way you don't expect from a franchise about shooting thousands of aliens. Seventeen tracks that function as a stress meter for your gameplay. If you want to study how adaptive music actually works in shooters, this is a clean example.