London-born producer and songwriter Jamie Hartman has a knack for harnessing an artist’s most vulnerable moments—particularly when he’s co-penning big ballads alongside singer/songwriter heavyweights like Rag’n’Bone Man, Lewis Capaldi, Birdy and James Bay. But he can also bring that same emotional heft to an eclectic range of feel-good dance cuts (Kygo’s “Stargazing”) and warm, cozy soul grooves (Celeste’s “Strange”).