In this example, the player is evolving in a Doomlike game, exploring a dark factory on an alien planet, then as they get closer to an enemy, the music becomes more tense. When the player is engaged with the enemy the music changes to action (guitar heavy) to support the player until they win.

In this video the player goes through 3 different phases:
-Spotted by an enemy
-Fighting the enemy
-Wining the fight