1. In a system including a first document containing at least some information in common with a spoken audio stream, a method comprising steps of: (A) determining that text in the first document represents an instance of a concept, comprising determining that the text has a format associated with the concept; (B) replacing the identified text with a context-free grammar specifying the plurality of spoken forms of the concept to produce a second document; (C) generating a document-specific language model based on the second document, comprising generating at least some of the document-specific language model based on the context-free grammar; (D) using the first language model in a speech recognition process to recognize the spoken audio stream and thereby to produce a third document.