5. The method of claim 1 , where ranking the audio files further comprises: scoring each query word relative to each sparse feature vector and combining the scores across words to rank audio files relative to the query.
5. The method of claim 1 , where ranking the audio files further comprises: scoring each query word relative to each sparse feature vector and combining the scores across words to rank audio files relative to the query. 6. The method of claim 5 , where scoring each query word includes calculating a dot product between a set of weights for that word and a representation of the audio file with a particular sparse feature vector.