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FUNDAMENTAL DETAILS.
TIME .-- Time is the same thing in music that it is everywhere else in nature.

It is what passes while a piece of music is being played, sung, or read.

It is like the area of the surface upon which the musical structure is to be erected, and which is measured or divided into so many units for this, so many for that, so many for the other portion of the musical Form.

Time is that quantity which admits of the necessary reduction to units (like the feet and inches of a yardstick), whereby a System of Measurement is established that shall determine the various lengths of the tones, define their rhythmic conditions, and govern the co-operation of several melodies sung or played together.
Time is the canvas upon which the musical images are drawn--in melodic _lines_.
TEMPO .-- This refers to the degree of motion.