Guess the Theme Quiz Singing Relay
https://www.youtube.com/playlist?list=PLgHa-AlX7tfcdDa-HYlCfrFILJ-Q_TdoOA relay where chat? can win prizes for guessing the right songs. Not really sure but using the answer form in their description should help. Deadline is on the 17th before Midnight JST. They'll announce the winners on the 18th at 9 PM JST.