To introduce his first album since the COVID era, Ghostemane released “Zero Day,” an unabashed tribute to ’90s rap metal—not to mention an almost note-for-note melding of Korn and Limp Bizkit. The West Palm Beach, Florida native known to his parents as Eric Thomas John Whitney seems to acknowledge his six-year absence on opener “Alive!” Tracks like “NSFW” and “Cyberia” revel in the online-isms that dovetail with his 2010s emergence as a Soundcloud rapper, while the sparse but groove-driven “BucketList” revolves around a deep bass pulse and a spooky piano melody.