9. The method of claim 1 , where detecting a refrain in each of the audio files includes generating a phonetic transcription of a majority of the audio file; and identifying a vocal segment in the generated phonetic transcription, that is repeated at least once.
9. The method of claim 1 , where detecting a refrain in each of the audio files includes generating a phonetic transcription of a majority of the audio file; and identifying a vocal segment in the generated phonetic transcription, that is repeated at least once. 10. The method of claim 9 , where generating the phonetic or acoustic representation of the refrain includes processing the audio file by a method comprising: detecting a refrain of the audio file; generating either or both a phonetic or acoustic representation of the refrain; and storing the generated phonetic or acoustic representation together with the audio file.