Although Kerouac's later works were much more experimental in terms of style and narrative, On the Road, his second novel, was a breakthrough for him. He discovered his voice while writing the novel, and he began to develop his practice of "spontaneous prose." (He later wrote two short essays on his methods at the request of Allen Ginsberg and William Burroughs, "Essentials of Spontaneous Prose" and "Belief and Technique for Modern Prose.") Kerouac wanted to write in the same manner that a great bop jazz musician, such as Charlie Parker, played his instrument, and thus he invented a form of writing he called "bop prosody."