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The Lagos-born, Marseille-based singer Nyra Okonjo has spent the better part of a decade arguing that a pop song can hold more than one weather system at once. Since the release of her wiry breakout record, “Harbour Static,” in 2019, she has folded highlife guitar, dub delay, and the flat, unbothered cadence of spoken French into songs that never quite settle where you expect them to.

“Salt & Signal,” her fourth album, is the widest of them — nineteen tracks, recorded across three cities, and the first she has produced alone. The results are less a reinvention than an inventory: a percussion suite built from harbor recordings, a duet with the veteran juju bandleader Tunde Alabi, and a closing ballad that runs almost seven minutes on a single held organ chord.

Live, she has been staging it as one continuous set, with a nine-piece band and a horn section that appears only in the final third. Reports from the tour’s European leg describe a show that starts almost too quietly — and then, an hour in, refuses to stop moving.