Biletska grew up as Maryna Biletska. Originally from a city called Cherkasy in Ukraine. Her father left to join a cult before she was born, so she grew up with a single mother who worked tirelessly to provide enough for themselves to get by. Her mother met her step-dad when Maryna was 4, and neither shared her passion for music. Instead of hanging at the mall, this young athletic teen went to choirs and devoted a lot of time to her favorite animals - parrots. She also spent her time writing poetry and drawing illustrations based on her dreams of getting out of Ukraine and the one-bedroom shoebox apartment the three shared. Dreaming of being free, America seemed like the best place to be. The opportunity arose when she was 18 through the "work and travel" program at her university that took her to New York City, leaving her small town behind. NYC was a huge learning curve, and after several jobs in restaurants, her mother and step-father made her come back to Ukraine to finish her degree in applied linguistics. Maryna also enrolled herself in music college, where she studied stage performance and singing. At the same time, she was also attending a technological university, where she got her bachelor's degree in tour management.

Then, a dream came true when she got accepted to Berklee College of Music. This was the thing she had been waiting for to return to the United States. Unfortunately, she was denied a visa. This was crushing news for her, and Maryna made it her mission to do everything to find a solution to get back to the states. 

Then two opportunities came that changed everything. Firstly, Maryna got accepted on The Voice, and the other was getting an offer to tour Europe with Michael Angelo Batio, the fastest guitar shredder of all time and inventor of the double guitar. This incredible experience helped Maryna to build confidence as a singer and performer. After the month-long contract was over, he offered her a year-long commitment to tour the U.S. They hired a top immigration lawyer, and after some time Maryna finally got the visa she had been denied earlier. A year before she left Ukraine, she had recorded her first solo album under the moniker "Marsy Flame," releasing it when she moved to Nashville in 2019, knowing that she wanted to pursue a full-time career in music. Music City seemed a perfect choice. This is where she met her latest collaborator, the other half of pop duo Cosmo Santo and began her love affair with pop music and songwriting. Cosmo released the EP "Sunda" in 2019 followed by their latest single “Chameleon” on June 4, 2021.

Biletska is currently working on a solo pop/electronic project and is also working with other artists in Nashville. She released a song called “Fallen” and will be releasing new music later this summer.