The most prominent and legitimate reference is the album the debut album by the Houston, Texas-based band Dead Horse .

The Genesis of Horsecore: Dead Horse and the Texas Metal Scene

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The band—consisting of Michael Haaga (vocals/guitars), Greg Martin (guitars), Allen "Alpo" Price (bass), and Ronnie Guyote (drums)—stood out because they matched intense, chaotic musical technicality with a dark, satiric sense of humor. Tracks like "Piece of Veal" and "Adult Book Store" proved they never took themselves too seriously, differentiating them from the hyper-serious tone of their contemporary metal peers. Decoding the "2008 62" Connection: The P2P File-Sharing Era

To understand the keyword, one must first look at the musical history of "Horsecore." Long before it became tied to specific internet search strings, "Horsecore" was a term deeply embedded in the underground extreme music scene. The Dead Horse Legacy