I got most of these from Project SEKAI’s twitter account.
Also thanks to @tsubomi3722 (https://youtube.com/@tsubomi3722?si=AP9paOG9SIb8FCiZ) for reuploading some of these to YouTube.
Singing to those without any lyrics is quite fun!
NOTE: Becoming potatoes has no song teaser. I believe it’s due to it being released by Neru before Project SEKAI released, so it being a commissioned song was already known.