I don't know why, but I've grown very attached to Endless Legend's factions, so much so that many songs make me think of them. A few in particular stand out.

It's bit ridiculous so I thought why not share it here? I'd be keen to see which songs remind you of EL and one of its fantastic factions! 

Ardent Mages (obligatory BDSM song)

Cult of the Eternal End:

Morgawr:

Allayi (necessarily tragic):