The term 'BEATNIK's Beat Source' is a reference to the BONGO drums, which were popularized by beatniks in the 1950s and 1960s. BONGO drums are a type of percussion instrument consisting of two small drums connected by a single piece of wood. They are typically played with the hands and are used to create a variety of rhythms. The BONGO drums were an important part of the BEATNIK culture, and they were often used to accompany poetry readings and other performances.