// audioFile must already be clipped
static Map<S, Float> similarityToClippedRecordings(File audioFile) {
  BWImage img = audioFileToFrequencyImage(audioFile);
  new TreeMap<S, Float> map;
  for (File f2 : listFilesWithExtension(recordingsDir("clipped"), "wav")) {
    BWImage img2 = audioFileToFrequencyImage(f2);
    float sim = bwImageSimilarityResized_ignoreRatioMismatch(img, img2, 0f);
    print(formatDoubleX(sim*100, 2) + "%: " + f2.getName());
    map.put(f2.getName(), sim);
  }
  ret map;
}