He got his start as a rock-literate jungle DJ, lugging his record box into pirate radio stations. And Dylan Mills hurtles through the varied musical styles that have shaped him on this confident, atypically collaborative third effort. From the thrashy coda of “Sirens” and the Shy FX-assisted heatwave banger “Da Feelin’” to the irrepressible cheek of Lily Allen duet “Wanna Be,” Maths + English is a surprising, celebratory achievement with an untouchable MC at its core.