1. A computer program product for vocalizing a digital work of literature, comprising: a tangible, computer-readable storage memory device; and program instructions encoded by the tangible, computer-readable storage memory device, for causing a processor to perform operations comprising: analyzing a first digital work of literature using natural language processing to identify speaking character voice characteristics associated with context of each quote as extracted from the first work of literature; converting the character voice characteristics to audio metadata to control text-to-speech audio synthesis for each quote; transforming the audio metadata into text-to-speech engine commands, wherein each quote is associated with audio synthesis control parameters for rendering the corresponding character voice characteristics according to the context of the quotes in the first work of literature; and inputting the commands to a text-to-speech engine to cause vocalization of the first work of literature, wherein spoken quotes by characters are vocalized according to the words of each quote, character voice characteristics corresponding to each quote, and context corresponding to each quote.