O.S.T.R. is a Polish rapper, producer, and songwriter known for his unique style that blends hip-hop with jazz and soul influences. His real name is Adam Ostrowski, and he has been active in the music industry since the late 1990s. O.S.T.R. is recognized for his intricate lyrics, often addressing personal and social issues, and has released numerous albums throughout his career. In addition to his solo work, O.S.T.R. has collaborated with various artists and contributed to the Polish hip-hop scene. He is also known for his live performances, where he showcases his skills as both a rapper and a musician. His contributions have made him a significant figure in Polish music and hip-hop culture.