ONCE AGAIN THEY TELLS ABC'S PHIL LIPOF THERE'S NO LIMIT TO WHAT SHE CAN ACCOMPLISH NOW. � LET ME SHOW YOU HOW � >> Reporter: VIRAL SENSATION MUNI LONG MAY SEEM LIKE AN OVERNIGHT SUCCESS. BUT THIS BREAKOUT SOLO ARTIST HAS ALREADY MADE QUITE A NAME FOR HERSELF AFTER SPENDING 12 YEARS WRITING CHART-TOPPING SONGS FOR ICONS LIKE ARIANA GRANDE, MARIAH CAREY, RIHANNA, KELLY CLARKSON COWRITING "LOVE SO SOFT." � LOVE SO SOFT � >> Reporter: NOW IT'S HER TIME. � YOURS MINE OURS � >> Reporter: SHE RELEASED "OURS AND OURS" IN JANUARY, QUICKLY VIEWED BY TENS OF MILLIONS ON TIKTOK AND OTHER SOCIAL MEDIA. IT PUT HER EXACTLY WHERE SHE WANTS TO BE, OUT FRONT, ON TOP, AND SINGING HER OWN SONGS. >> I'M A FAN OF WRITING ABOUT NUA NUANCED PERSPECTIVES. DIFFERENT MOMENTS AND DESCRIBING HOW THAT FEELS. IT'S PRETTY EASY WHEN YOU KEEP IT TRUTHFUL. >> Reporter: HER TRUTH TURNED INTO HIT AFTER HIT, COWRITING NUMBER ONE SONGS LIKE -- � IT'S GOING DOWN � >> Reporter: AND -- � BABY AIM WORTH IT UH-HUH I'M WORTH IT � >> ONE OF MY FAVORITE LYRICS THAT I'VE EVER WRITTEN IS FROM "CALIFORNIA KING BED." >> I LOVE THAT SONG. >> THANK YOU. � THIS FELT JUST LIKE THE INSIDE OF A ROSE � >> I'VE NEVER KISSED A ROSE, SO I DON'T KNOW, BUT I ASSUME THAT IT'S VERY SOFT. >> Reporter: BEAUTIFUL LYRICS, BUT THE WRITING CREDIT ON THAT SONG AND SO MANY OTHERS LISTS PRISCILLA RENEE, NOT MUNI LONG. >> MUNI LONG, THE NAME AND THE CHARACTER THAT I CREATED, WAS REALLY JUST THE PERSON THAT I ALWAYS WAS AND THE WAY THAT I ALWAYS SAW MYSELF. >> Reporter: BORN IN VERO BEACH, FLORIDA, PRISCILLA STARTED SINGING AT AGE 2, WROTE HER FIRST SONG AT 8. A PROLIFIC, GIFTED SONGWRITER WITH FINANCIAL SUCCESS. AND YET THE CONSTANT FEELING OF WANTING MORE. >> A LOT OF TIMES YOU WALK INTO A MANY ROO, I COULD HAVE ALL THESE ACCOLADES AND HITS, BUT THE ARTIST I'M WORKING FOR HAS NO CLUE. RARELY DO YOUR COWRITERS ACTUALLY KNOW WHO YOU ARE. >> THAT BREAKS MY HEART A LITTLE BIT. >> IT'S LIKE SPEED DATING. YOU GOT FOUR TO EIGHT HOURS TO WRITE A HIT SONG. AND YOU'RE DOING THIS EVERY DAY. � I COULD DO THIS FOR HOURS � >> Reporter: A DECADE OF PITCHING AND SELLING HER SONGS, CHASING HER DREAMS. ALL WHILE WAKING UP EVERY DAY IN PHYSICAL PAIN. QUIETLY BATTLING LUPUS, AN AUTOIMMUNE DISEASE THAT CAN BE DEBILITATING, EVEN DEADLY. >> I HAD A FEW SCARES WHERE I THOUGHT, WHAT IF I DON'T MAKE IT? DEALING WITH RESPIRATORY ISSUES. I THOUGHT, IF I DIE, WOULD I BE HAPPY WITH WHAT I HAVE DONE SO FAR? AND AT THE TIME I ASKED MYSELF THAT, THE ANSWER WAS NO. SO I DECIDED THAT I WOULD STOP DOING THINGS I DON'T WANT TO DO. AND JUST ONLY DO WHAT I WANT TO DO. NO MATTER WHAT ANYBODY THINKS. >> Reporter: THEN THIS, AN EMPOWERING ENCOUNTER WITH JAY-Z AT A PARTY. HE SAID TO YOU WHAT? >> HE JUST SORT OF, LIKE, MOTIONED TO ME TO LIFT MY HEAD UP, YOU KNOW. CAME DOWN TO MY LEVEL. "HI, I'M SEAN." LETTING ME KNOW THAT I'M NOT SMALL. YOU KNOW. DON'T MAKE MYSELF SMALL. >> Reporter: A POWERFUL SENTIMENT THAT WOULD TURN INTO A MANTRA AND EVENTUALLY TRANSFORM PRISCILLA INTO MONEY. � DON'T WANNA GRAB ON NO NAH � >> IT TOOK ME A LONG TIME TO REALIZE THAT I HAD A CHOICE ABOUT WHO I WANTED TO BE. >> Reporter: CONFIDENT, TAKING CONTROL OF HER FUTURE, AND POSSIBLY SHAPING OTHERS. � OH MY GOD CAN I SING TO YOU � >> A HUGE PART OF IT FOR ME IS REPRESENTATION. YOU KNOW. WHEN YOU LOOK AT ALL THE LITTLE BLACK GIRLS THAT ARE SINGING MY SONGS ON TIKTOK, BABIES THAT CAN'T EVEN BARELY TALK. AND THEY'RE LOVING MY MUSIC. I COULD NOT DO THAT AS PRISCILLA. � AND EVEN THOUGH YOU'RE PRETTY WITH AN ATTITUDE � >> Reporter: THAT BRINGS US A NEW ALBUM OF HER SONGS. SHE SINGS THEM ALL UNDER A RECORD LABEL SHE BUILT AND RUNS. >> I PUT A LITTLE ACTING ON. >> THAT'S PART OF CREATION. >> YEAH. I LIKE TO KEEP MY LYRICS UNIVERSAL. SO, LIKE, A LOT OF TIMES I COULD JUST BE TALKING ABOUT THE HUMAN RELATIONSHIP. >> Reporter: SONGS ABOUT LOVE, RELATIONSHIPS, LIFE. PRISCILLA'S WORK WILL ALWAYS BE THERE, BUT MUNI IS JUST GETTING STARTED. >> I JUST DON'T HAVE ANY LIMITS. LIKE, THERE'S LITERALLY NO