Mariah the Scientist has officially arrived at a defining moment in her career with the release of her fourth studio album, Hearts Sold Separately, out now via Buckles Laboratories and Epic Records. Where her 2023 effort To Be Eaten Alive leaned on heavyweight features, Hearts Sold Separately places the spotlight squarely on her own artistry, with nine solo tracks and a single collaboration—an unforgettable pairing with Kali Uchis on “Is It a Crime.” The result is a body of work that feels bold, intentional, and arguably her strongest to date.
For Hearts Sold Separately, Mariah crafted a cinematic narrative around the record, beginning with the haunting “Burning Blue” music video and expanding it into a full-length trailer filled with striking visuals, military-inspired symbolism, and guest appearances from Love Island’s Michelle “Chelly” Bissainthe and rapper Karrahboo.
Musically, many tracks leave a lasting impression. From “Sacrifice” with Kali Uchis to “Eternal Flame,” Mariah has crafted a near-perfect R&B album.
The anticipation leading up to the album was fueled by undeniable momentum. “Burning Blue” became Mariah’s breakout hit, cracking the Billboard Hot 100’s Top 25, going Gold in the U.S., and topping both Rhythmic and Urban radio charts.
Now that the full album is finally here, the question becomes: which songs rise above the rest? With Hearts Sold Separately, Mariah the Scientist has delivered one of 2025’s best R&B records. See below for our full ranking.
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