巡りの歌 Off Vocal Short Ver Extended to 20 minutes+
The off vocal version from the short ver of Meguri no Uta. Sadly can't find the off vocal of full ver.
Other Shironeko Project extended BGM:
https://www.youtube.com/playlist?list=PLJSFfiBIf4LDlQUpy154dNJiRqeVQaZA3