One technique for adding expression to music is the which indicates the slowing or speeding of tempo to add emotion.

One technique for adding expression to music is the Rubato, which indicates the slowing or speeding of tempo to add emotion.

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.