It was an instrument with 1 chord, 1 m long, with a sort of a pipe above similar to the one in the cover of [this](https://open.spotify.com/track/3YV5Vlz4EvaFdYy9lxisYE?si=57-g1CKhQruJGPU_m4SIlQ&utm_source=copy-link&context=spotify%3Aplaylist%3A37i9dQZF1DX0x3hhpH7R9I) song.
May you help me telling me what’s its name?
https://www.reddit.com/r/japan/comments/10hzahl/ive_just_seen_an_old_japanese_guy_playing_an/