Okay went through my Supernatural OST and found some good gems for Creepy and Sad ambient music, and a couple battle music. I realized that not everyone would be able to recognize song titles for a show like Supernatural so I included links to youtube where the songs are hosted.
Creepy AmbientSupernatural - Track 3 -
The LibrarySupernatural - Track 4 -
Let's Go HuntingSupernatural - Track 5 -
Searching HistorySupernatural - Track 7 -
On the BridgeSupernatural - Track 8 -
Into the LoftSupernatural - Track 15 -
Penance\MurderSupernatural - Track 16 -
The MorgueSupernatural - Track 18 -
Evil AwaitsSupernatural - Track 24 -
Hell HouseSad AmbientSupernatural - Track 6 -
A Father's DespairSupernatural - Track 9 -
He Can't SpeakSupernatural - Track 12 -
A Lonely PictureSupernatural - Track 14 -
Sam Opens UpSupernatural - Track 17 -
NightmareSupernatural - Track 20 -
Dean Comforts SamSupernatural - Track 22 -
Dad is AliveSupernatural - Track 23 -
No One Believes Me Supernatural - Track 25 -
Sam Can Love AgainBattle MusicSupernatural - Track 10 -
Not the Lake Supernatural - Track 11 -
Boys Break In Supernatural - Track 13 -
The Water Attacks Supernatural - Track 19 -
Fighting the Beast Darth Drakaunus