Why does the ingame Summoners Rift music not get intense like it does in the album version?

Or like in the first few trailers? The login theme?

The music is continually calm throughout the entire match, even when your/enemy inhibitors are all down and someone has baron, the music is relaxing rather than full of crescendos and making the match feel close to an end. I feel like this is wasted potential when it comes to the main map's music and I feel it would give me a little more incentive to actually listen to the wonderful music you guys made instead of my own if I could hear the progress I was making in my match.