Angels and Demons - Angel Waltz
Here is an interactive track with three intensity levels from my Angels and Demons pack for Unity. Simply click on the intensity level to hear the shift. Click on whatever intensity level is playing to stop the music.
You can buy the full asset on the Unity Assetstore for just 10$: https://assetstore.unity.com/packages/audio/music/orchestral/angels-demons-audio-pack-38013