1. A method comprising: accessing an audio segment comprising speech content from a plurality of sources, wherein different speech segments of the speech content correspond to different ones of the plurality of sources; parsing the speech content into a sequence of phonemes wherein each phoneme corresponds to a basic unit of speech of the speech content; generating a phonetic index from the sequence of phonemes; and associating a corresponding one of the plurality of sources with phonemes in the sequence of phonemes of the phonetic index such that a source associated with a given phoneme or group of phonemes in the sequence of phonemes of the phonetic index is ascertainable.