“While the gritty streets of London often inform violent lyrical turns and bone-rattling aural assaults, Mr. Mitch’s productions are a stark counterpoint to the grime status quo: his synths flutter softly and his drums remain spare and broken. In the hands of many other MCs, a track called “Priority” would be a series of boasts about women, money, and drugs—but for London’s P Money (aka Paris Willi”