Before Shrek enters Fiona's tower, what type of instrument is she playing?

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.

Pop music is music that is popular made by popular artists

Here is the answer. the fundamental element of music that can be defined as the succession of articulated durations is rhythm. hope this is the answer that you are looking for. have a great day ahead!