8. A method for converting text to speech, the method comprising: at an electronic device with a processor and memory storing one or more programs for execution by the processor: parsing a document to identify a subset of text to be converted to speech, the subset of text having a context; creating an announcement comprising a spoken description of the context; determining, by the processor, an order in which the announcement and a spoken form of the subset of text are to be spoken, wherein the determined order comprises speaking the announcement prior to the spoken form of the subset of text; and generating audio that includes the spoken form of the subset of text and the announcement, wherein the announcement is spoken prior to the spoken form of the subset of text.
8. A method for converting text to speech, the method comprising: at an electronic device with a processor and memory storing one or more programs for execution by the processor: parsing a document to identify a subset of text to be converted to speech, the subset of text having a context; creating an announcement comprising a spoken description of the context; determining, by the processor, an order in which the announcement and a spoken form of the subset of text are to be spoken, wherein the determined order comprises speaking the announcement prior to the spoken form of the subset of text; and generating audio that includes the spoken form of the subset of text and the announcement, wherein the announcement is spoken prior to the spoken form of the subset of text. 11. The method of claim 8 , further comprising: identifying a second subset of text while parsing the document, the second subset of text having a second context that is different from the context; and creating a second announcement comprising a spoken description of the second context; wherein the generated audio includes a spoken form of the second subset of text and the second announcement, wherein the second announcement is spoken prior to the spoken form of the second subset of text.