'Applause'
  'Appliance_alarm'
  'Baby_cry'
  'Car_horn'
  'Cat_meow'
  'Civil_defense_siren'
  'Clap'
  'Cough'
  'Crowd'
  'Dog_bark'
  'Doorbell'
  'Emergency_vehicle_siren'
  'Female_speech'
  'Finger_snap'
  'Fire_smoke_alarm'
  'Glass_break'
  'Guitar'
  'Gunshot'
  'Hiccup'
  'Humming'
  'Knock'
  'Laughter'
  'Loud_engine_acceleration'
  'Male_speech'
  'Piano'
  'Scream'
  'Sigh'
  'Sneeze'
  'Snore'
  'Throat_clear'
  'Thud'
  'Tire_squeal'
  'Tongue_click'
  'Water_run'
  'Whisper'
  'Whistle'
  'Yell'
  'Others'