You are listening to one of the soundtracks from Mushi-Shi (蟲師) OST Collection. Works contained are published under the name of Toshio Masuda (増田俊郎), the composer of Mushi-Shi anime. The collection of these videos presents the following works:
Mushishi (蟲師) Original Sound Track (オリジナル サウンドトラック) — Before The Sound Of Insects (蟲音 前)
Discogs: https://www.discogs.com/増田俊郎-蟲師-オリジナル-サウンドトラック-蟲音-前/release/5619177
Playlist: https://www.youtube.com/playlist?list=PL2EO_Vc8r8e3q4ZcfSEMMrBkhPkCYeWMn
Mushishi (蟲師) Original Sound Track (オリジナル サウンドトラック) — After The Sound Of Insects (蟲音 後)
Discogs: https://www.discogs.com/増田俊郎-蟲師-オリジナル-サウンドトラック-蟲音-後/release/5619205
Playlist: https://www.youtube.com/playlist?list=PL2EO_Vc8r8e1bHkyKtahLwxrrWu2IfFVs
Mushishi (蟲師) Sound Track (サウンドトラック) — The Sound Of Insects (蟲音) (Mushinone (むしのね)) — Continued (続)
Discogs: https://www.discogs.com/増田俊郎-蟲師-サウンドトラック-蟲音むしのね-続/release/8901024
Playlist: https://www.youtube.com/playlist?list=PL2EO_Vc8r8e0vNmWfZwftHCCH66PvGhl_
Mushishi (蟲師) Sound Track (サウンドトラック) — The Sound Of Insects (蟲音) (Mushinone (むしのね)) — Conclusion (結)
Discogs: https://www.discogs.com/増田俊郎-蟲師-サウンドトラック-蟲音むしのね-結/release/12924616
Playlist: https://www.youtube.com/playlist?list=PL2EO_Vc8r8e2EnXXvo6KUNovrHQAr6NAT
Other works from Toshio Masuda (増田俊郎): https://www.discogs.com/artist/2906439-Toshio-Masuda
Mushi-Shi anime on MyAnimeList: https://myanimelist.net/anime/457/Mushishi
Mushi-Shi Zoku Shou anime on MyAnimeList: https://myanimelist.net/anime/21939/Mushishi_Zoku_Shou
Art Cover:
幻電放映: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=43846704