The theme song of the Yamaguchi-gumi: 'Ninkyo Hitosuji' is the catchy theme song of the Yamaguchi-gumi. It was removed from YouTube, and this video features a slideshow of pictures of boss Shinobu Tsukasa. I will put the link to a better version as soon as I find it (sorry for the commercials before the video!).
Demukae: this is a celebration for the release of prison of a high-ranking member of the Asano-gumi. In this video you can see the arrival and welcoming of the guests.