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Alright, I've heard suggested genres from grindcore to deathcore to metalcore. Grindcore and deathcore are derivatives of death metal, and this band certainly doesn't perform in that style. Metalcore seemed more feasible to me, but this band isn't known for its breakdowns and is nothing like most modern metalcore. Then... I discovered... mathcore! Mathcore is a fusion of metalcore, grindcore, and math rock (an experimental rock music genre). Mathcore is known for unusual time signatures and other experimental characteristics. I certainly feel that this properly describes the band. Other primary genres that the band represents include experimental metal and electronica.
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These sources support that Astral Rejection demonstrates mathcore: