1) Musical instruments 
2) Nature
 A. Wind
 B. Running water
 C. Surf/tides.
 D. Storms
  i. Lightning
  ii. Thunder
  iii. Tornado/hurricane wind
 E. Earthquake
 F. Treefalls.
 G. Calving glaciers
3) Animals
4) Cars & bikes
 A. Engines      
  i. Revving
  ii. Idling
 B. Tires squealing
 C. Crashes
 D. Horns
5) Aircraft
 A. Light planes
 B. Helicopters
 C. Jets
6) Weapons
 A. Guns
  i. Automatic
  ii. Single shot
7)