1. A method, comprising: performing by a computer: accessing a previously identified collection containing a limited number of phoneme sequences; for each file of a plurality of files: detecting at least one sequence of phonemes in the file's audio component; comparing the at least one sequence of phonemes detected in the file's audio component to the collection of phoneme sequences; and generating a score, based on said comparing, that indicates a similarity between the at least one sequence of phonemes detected in the file's audio component and one or more of the phoneme sequences in the collection; and determining similarity of two or more of the plurality of files to each other based on the generated scores.