Kelethin:
https://www.youtube.com/watch?v=i5hgTdsP9xg#t=329
Because it's plagiarized from the kelethin music.
Any zone you're powerleveling in:
https://www.youtube.com/watch?v=vK4gv11PTI8
Unrest:
https://www.youtube.com/watch?v=tSdSemAMzdY
West Karana:
https://www.youtube.com/watch?v=lasWefVUCsI
North Karana:
https://www.youtube.com/watch?v=lasWefVUCsI
South Karana:
https://www.youtube.com/watch?v=lasWefVUCsI
East Karana:
https://www.youtube.com/watch?v=lasWefVUCsI
Playing on Shards of Dalaya under the rules of permadeath, no mansion of portals, can't accept buffs or group with anyone else, first person, lowest clip-plane, can only use what I loot, craft or quest as a ranger, this song comes to mind:
https://www.youtube.com/watch?v=YBfkDH3F1GA
He's level 42 right now, but haven't touched him in years.
One of the most atmospheric and depressing gaming experiences of my life. I loved it.