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Don't they cycle the original music but have added music from the Gold Coast and Thieves Guild?
No they don't. Each zone plays one OST or another. Stonefalls/deshaan/shadowfen now exclusively play the 3 hours odd of music from the Thieves Guild OST.
Rivenspire will often start off with piece of the base game OST, then switch to the music from the Gold coast. Likewise, northern Glenumbra also plays the Gold Coast music.
There are some zones that play the music from Wrothgar as well.
Xbox One - EU - EP/DC
Trying and failing to hold the walls of his Templar house up since 2015