A "proper" duet version of Kuroi Uta by Emi Evans and Eir Aoi, using "Dispossession" by Keiichi Okabe as an introduction to the song. Released to celebrate the NieR Reincarnation X Drakengard 3 Crossover global event: https://www.youtube.com/watch?v=8Ei-7kPZbbw .
There's also a small additional "easter egg" in the song to be found :).
Update! @patalacarbo in the comments found the Easter Egg 🎉. The bells from the Kuroi Uta segment of “the final song” (Saigo no Uta), which is the song that plays during the DOD3 rhythm game battle, was sped up to match the tempo of Kuroi Uta and added from 6:36 to 7:02. @Pheynics was on the right track with the bells, it was very close. Thanks to all that tried to find it!
Image artist: Jutabee @pixiv (https://www.pixiv.net/en/artworks/92371213)