The song "The Dreamyard (Basement)" from Pokémon Black and White without its melody, extended to 15 minutes.
5 minute version: [ Ссылка ]
If you would like an extended version, comment to let me know, and I'll make one.

Extracted with VGMTrans, modified with Synthfont, and edited with Shotcut.
Link to playlist: [ Ссылка ]

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