4. The method of claim 1 , where selecting an audio file based on the best matching result of comparison includes selecting the audio file based additionally on either or both the phonetic or acoustic representation of the refrain.
4. The method of claim 1 , where selecting an audio file based on the best matching result of comparison includes selecting the audio file based additionally on either or both the phonetic or acoustic representation of the refrain. 5. The method of claim 4 , where selecting an audio file based on the best matching result of comparison includes selecting the audio file based additionally on the phonetic data of the refrain.