Thirty-two tracks of ambient medieval chamber music named after Tamriel's calendar and it works way better than you'd expect. The Elder Scrolls: Castles soundtrack plays like background music for managing a dynasty, which is literally what the game is.
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The Serenade series cycles through gentle lute and recorder arrangements that feel straight out of a castle courtyard. The Labor tracks shift from dawn to night with subtle instrumentation changes, strings warming up in the morning and fading to solo harp by nightfall.
Nocturne I through IV get darker and more contemplative each time. Sweetroll is in here too, and yes it sounds exactly as cozy as the name implies. Great low-key ambient listening for anyone building kingdoms between bigger gaming sessions.