（解説文要約）
炭坑には娯楽はあまりありません。
そこで元気あふれる青年の中には踊りや歌に専念する者もいたようです。
酒宴で披露するとみんなに喜ばれます。ヤマの酒宴は、絆を深める重要な場だったようです。
There were few amusements for people at pits. Therefore, some energetic young men at pits dedicated themselves to dancing and singing.
They danced and sang for entertainment at drinking parties to delight their coworkers.
It seems that drinking parties at pits were important to knit miners together.