Karol Szelast is a Polish songwriter and music producer performing under the pseudonym Shelast. He actively works in the genre of hip-hop and rap. He is one of the key members of the music project “Nowe Rozdanie: Rhythm + Flow Polska”. “Podziemie Freestyle” is a composition released as part of the show *Nowe Rozdanie S1*, where Karol Szelast also took part in writing the lyrics.