a few years ago nija charles was just another fan in the crowd.passion for music from her college dorm to the top of the charts with some of today's biggest artists. ears abc's ashen singh. ♪ don't listen to nobody >> reporter: this 21-year-old is the music industry's secret weapon. writing songs for some of today's biggest stars. >> you know, beyonce's top of the top. when i was able to work with her it was just like -- i made it made it. >> reporter: from beyonce and jay-z's "love happy." to "ring," the hit track on cardi b's grammy-nominated album. >> cha it ring ring powerhouse in action. ♪ i'm doing it >> reporter: out of that smallo so unique that stars have her on speed dial. >> hey, wes! >> reporter: in this session she's working alongside merta beats, one of the biggest producers in hip-hop known for chart-toppers like drake. ♪ working hard girl every day >> it's very effortless. i come to the studio, she can pull up on me, i pull up some beats, she can just go crazy. ♪ can you tell me you had eyes on ♪ >> it's crazy because it's like my