This post has a bunch of unordered youtube videos with music I love
A few themes: strong piano leads, polyrhythms, Japanese influence, OSTs, beautiful singing
Some of them are niche (~1-10K YT views) so hopefully you find something new you like!
Logical Emotion: トライアングルどら息息子
Dimash Qudaibergen: SOS d’un terrien en détresse (Piet Arion Cover)
Polyphia: Playing God
Boa: Duvet [Serial Experiments Lain] (Extended)
Kevin Penkin: Hanezeve Caradhina [Made in Abyss OST] (Takeshi Saitou Cover)
Deemo: Marigold (ふぃくしのん / phyxinon cover)
Nobuo Uematsu [FFXIV OST]: Great Gubal Library (Hard) Theme
Masayoshi Soken [FFXIV Endwalker OST]: Piano Covers by SLSMusic
Tosin Abasi: Thump
Keiichi Okabe [Nier Automata OST]: 壊レタ世界ノ歌 / Weight of the World
Shibayan Records: Fall in The Dark
Xi: Anima
Clowncore: Computers
Animals as Leaders: Behaving Badly
Coprofago: Motion
Gojira: The Art of Dying
狼と香辛料 (Spice and Wolf: 旅の途中 (OP)
Bobby Jarzombek: Selected Drum Solos
Infected Mushroom: Dancing With Kadafi
Ashleigh Bridges (OSRS OST): Coil
ダンベル何キロ持てる？: お願いマッスル (OP)
Meshuggah: New Millennium Cyanide Christ
Keiichi Okabo (NieR Automata OST): 遊園施設 (Amusement Park)
Iconoclasm: perditus†paradisus
Nobuo Uematsu [FFXIV OST]: The Lost City of Amdapor (Hard) Theme
Uneven Structure: Awe
Shiho Fujii, Atsuko Asahi, Ryo Nagamatsu, Yasuaki Iwata [Mario Kart 8 OST]: Dolphin Shoals
UNDEAD CORPORATION: The Revolution
Indricothere: III
Nekomimi Syndrome: Fur War, Pur War
All That Remains: Six
An: Sadistic Confusion
Andy James: Burn it Down
Kevin Penkin (Made in Abyss S2 OST): VOH ft. Takeshi Saito