1. A computer-implementable method for synthesizing audible speech, with varying prosody, from textual content, the method comprising: building an inventory of prosody models with designated characteristics; selecting a target prosody model for training based on input parameters and first keywords related to a first text segment of a first text with prosody annotations; training the target prosody models based on the prosody annotations of the first text segment; maintaining associations between the first keywords, the designated characteristics, and the input characteristics; selecting multiple prosody models for application for a second text segment of a second text based on second keywords related to the second text and the associations; applying the multiple application prosody models to the second text segment; reconciling conflicts from the application of the multiple application prosody models to generate reconciled prosody information; and generating audible speech for the second text segment based on the reconciled prosody information using a text-to-speech synthesis engine.