30. The method of claim 20 wherein taking the action comprises identifying a portion of the audio content that corresponds to the matching portion of the phonetic index.
20. A method comprising: accessing a phonetic index of a sequence of phonemes and associated source information wherein: each phoneme in the phonetic index corresponds to a basic unit of speech content of an audio segment comprising speech content from a plurality of sources, such that different speech segments of the speech content correspond to different ones of the plurality of sources; and the source information associates a corresponding one of the plurality of sources with the phonemes in the sequence of phonemes of the phonetic index; determining at least one phonetic search criterion in association with a search query wherein the phonetic search criterion corresponds to phonetic content; identifying a matching portion of the phonetic index that meets the at least one phonetic search criterion; and taking an action in response to identifying the matching portion of the phonetic index.