
Deatil from The Garden of earthly delights.
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Yes, this is genuine butt music from hell.
We know it is authentic because the notes are painted on the posterior portion of a pour soul confined to a desolate hellscape painted by Dutch artist Hieronymus Bosch (1450-1516), known for his fantastical style.

Deatil from The Garden of earthly delights.
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This scene from hell occurs in Bosch's most famous triptych, The Garden of Earthly Delights (c. 1495-1505). The main central image depicts the Garden of Eden, with heaven depicted on the left panel, and the Last Judgement depicted on the right.
The legit butt music from hell is played on lute, harp, and hurdy-gurdy by James Spalink. The melody is based on the transcription by Amelia Hamrick.