Felix Antoine Blume is a German rapper, known as Kollegah. He is also known as "Kollegah der Boss" or the pseudonym "T.O.N.I.". He is signed to the Hip-Hop independent label Selfmade Records. His rapping technique is heavily based on gangsta rap, but especially in the beginning of his career he frequently referred to his personal rapping style as "Zuhälterrap". Kollegah is known for his punchlines, double time-ability, complex and polysyllabic rhyme-structures.