Hip-hop and R&B offer some of the most fluid, dynamic sounds today, true barometers for where the culture is at and where it’s going. This week, headlining #OnRepeat—a playlist chock-full of the hottest new songs we can’t seem to stop playing—is “Burning Blue,” from Mariah the Scientist. Now, we could make the claim that a tender ballad comparing the intensity of being in love to the level of combustion that yields blue flame could have been written only by a woman who was once a biology major, but that would say nothing of the pipes it takes to sell it the way Mariah does. Listen to her do her thing on the #OnRepeat playlist, and if you hear something you like, add it to your library.