13. A system, comprising: a processor; and a memory coupled to the processor, wherein the memory stores program instructions executable by the processor to perform: 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.
13. A system, comprising: a processor; and a memory coupled to the processor, wherein the memory stores program instructions executable by the processor to perform: 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. 14. The system of claim 13 , wherein the plurality of files comprise video data.