Back in the postwar period, there were a lot of songs recorded and released about regular folks having to come into the big city or elsewhere away from their hometowns to find work. They may be working hard and saving up for their families but they truly miss their furusato. One big representative of that type of song is "Ahh, Ueno Eki"(ああ上野駅)from 1964 by Hachiro Izawa(井沢八郎)who sang about the young people flowing into Tokyo's Ueno Station from the various regions.
Another similarly-themed song came in a bit earlier. That would be "Souran Wataridori" (Souran Migratory Birds) from April 1961 by the Komadori Shimai(こまどり姉妹), Eiko and Yoko Namiki(並木栄子・並木葉子). I caught an episode of NHK's "Itsuki Sensei no Utau! SHOW Gakko"(五木先生の 歌う!SHOW学校...Itsuki-sensei's Singing Show School) on Tuesday..."Uta Con"(うたコン)has been on summer hiatus...in which the theme was Hokkaido songs, and "Souran Wataridori" was on the playlist.
The thing about "Souran Wataridori" is that the melody by Minoru Endo(遠藤実)and the the lyrics by Miyuki Ishimoto(石本美由起)are very familiar to me especially the chorus of "yaaren, souran, souran, souran"(ヤーレン、ソーラン、ソーラン、ソーラン)that the sisters chant out. Unlike "Aah, Ueno Eki" with its setting of a major station in the capital, I think "Souran Wataridori" is more likely set at one of the larger but regional port cities employing fishery workers who may have come south from Hokkaido or moved to one of the coastal cities in Japan's northernmost prefecture.
What I found out from jisho.org is that a souran bushi(ソーラン節)is a "traditional work song of Hokkaido herring fishery workers, performed by school students in modern choreographed interpretations". So, perhaps the workers didn't actually sing and bring in the fish in a rhythmic fashion but the teachers and kids interpreted their work that way.
In the first verse, though, there was a mention about someone plucking away at the shamisen so maybe the song wasn't just devoted to the migrant port workers but also to all those who left their hometowns (labourers, entertainers, etc.) to find work in the big cities. The Komadori Shimai themselves were born in Hokkaido and came to Tokyo to work as strolling musicians on the streets.