I really like the work you’ve done here! One thing to remember about lighting is that your scene doesn’t actually need to have a physical light emitting entity (like the torches) for you to add a light source that generally illuminates things.
We’re aiming to create a version of reality that looks good, and a lot of the time with lighting in games and film, that includes brightening things up so the player/viewer can see what’s happening. The ambient lighting comes from the same place the music does ^_~
I look forward to seeing more of your work!