Coal-fired machinery belongs to an earlier technological era—steam engines, furnaces, the Industrial Revolution. Describing someone as so fundamentally retro that they'd utilize coal to power music is to suggest not just nostalgia but active resistance to modernization. The guitar itself becomes a relic, an artifact.

Music journalist and Americana expert Derek Holland, researching old-school mythology for Smithsonian Magazine in 2009, interviewed coal miners in West Virginia who'd adopted this phrase: "One miner, Frank, said he figured if Chuck could do it, why not. November 2009, he'd actually tried to build a coal-fired guitar out of scrap metal. Didn't work, obviously, but the effort was sincere. The phrase had given him permission to take the joke seriously—not as humor but as a challenge."

The image persists because it conflates multiple retro impulses—coal, folk music, pre-electricity craftsmanship. In guitar forums and vintage music communities, the phrase surfaces whenever someone rebuilds a pre-1950s instrument. It's become shorthand for authenticity so extreme it circles back into parody.