Only the current version so far — new entries appear as the app ships updates.
フォークソングまとめ is a music & audio app by oldsea2 with 5,000+ downloads (about 8.2K estimated). +14 installs in the last 7 days. Released Nov 7, 2019. Install growth, rank history, SDKs and ad networks.
From the store listing: “This is a collection of popular folk songs for karaoke. You can freely enjoy more than 10,000 songs at any time, such as memorable old songs and famous songs that were a big hit in youth.”