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It's a genre of music that combines rock and opera.
Hardcore guitar solos + opera = operacore
by xxYuli June 24, 2006
A mixture of Metal, Metalcore, the shrinking of the gonads, and wailing mercilessly like a banshee screened over inaudible bass and mind-numbing chugging.
Hey have you ever heard of this band called This Time November from Austin Texas?

Of course bro! They're so Operacore.
by Kingofthemusicscene August 11, 2011