Kirill Pokrovsky has the music for the previous Divinity RPGs, and more, on his website. Note that the last time I visited there the description for Divinity 2 contained spoilers. There are also soundtracks in the GOG release bonuses for the individual games, and a couple music compilations with the Divinity Anthology, etc. You can also check Larian's twitch.tv and Youtube channels for more.