Like his ’90s neo-soul peers D’Angelo and Erykah Badu, Maxwell, mercurial master of smoothly sexy spaced-out R&B, operates on his own timetable. In the past 25 years, Maxwell has only released five studio albums, and they’re all lush and idiosyncratic bangers. Two of those five albums have been parts of a planned trilogy, but Maxwell hasn’t been in any hurry to complete that trilogy. BLACKsummers’night, the first volume, came back in 2009. Maxwell followed that one with blackSUMMERS’night seven years later, in the summer of 2016. Since then, the man has only released one non-album single, 2018’s “We Never Saw It Coming.” Today, Maxwell has announced that blacksummers’NIGHT, the third album in the trilogy, will arrive in spring of next year, and he’s also announced a forthcoming arena tour with Anthony Hamilton and Joe. With those announcements, Maxwell has shared “Off,” the new album’s first single.