The funk jam that closes “Night” couldn’t have come from anyone else (except maybe Prince).It could be the ample bank she and her husband, Wissam Al Mana, are sitting on, but Janet Jackson’s Unbreakable is so luxuriously chill it’s almost narcoleptic. But with the exceptions of “Dammn Baby” and “2 Be Loved,” both pretty explicit nods to DJ Mustard’s “ratchet” sound, Jam, Lewis and Jackson, who co-produced and co-wrote all the songs here, aren’t chasing or reviving trends. Some of the 17 songs shift between past and present: “Shoulda Known Better,” a muddled call for virtue (“We won’t accept excuses/We tolerate no abuses”), aims for U2’s spiritual liftoff in the chorus guitars “Gon’ B Alright” consciously evokes the rousing funk of Sly & The Family Stone (whom Jam and Lewis sampled in Jackson’s 1989 “Rhythm Nation”) through horns, guitar and live drums and “Dream Maker/Euphoria” pairs vintage Philly soul with clattering trap drums. In that song and “The Great Forever,” which starts with trip-hoppish electronics, Jackson considers how cruelly the world treats people who are kind and idealistic.

The highlight “After You Fall” isn’t much more than a minimal piano and a hushed vocal that proves how big a small voice can be.

“No Sleeep,” Unbreakable’s first single, continues the sex-positive theme that has been her mainstay since 1997’s The Velvet Rope, but it’s an outlier - unlike Damita Jo, this album isn’t slicked by massage oil. There’s nothing like a sure hit here, just expert adult-contemporary R&B, front to back. Which means that for Unbreakable, her first studio album since 2008, she brought back Jam and Lewis not to regain the glory of 1986, but to work with the people who know her best. But none of those songs was a hit in European countries less ashamed of the body either, so maybe it wasn’t just the “wardrobe malfunction.” She’s 49, and even if she wanted to cadge a visit with the Kardashians, pop culture has left her behind. She hasn’t had a top 10 single in the United States since 2001. But the albums she has released since the 2004 Super Bowl, where she exposed her breast during the halftime show and ignited a shitstorm, turned her career sales chart into a bell curve: It inspired the invention of YouTube and boosted TiVo sales but buried her own, as TV and radio seemed to blacklist her.

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