On a metaphysical basis, I submit that intelligence consists of two things:

1) The ability to observe and recollect external events;

and;

2) The ability to make determinations (or predictions) of ongoing events based upon your recollection of previous observations.

I don't necessarily agree that there are several types of intelligence. Yes, some of us have a musical ear, and some of us are good at persuasion. IMO, these are all aptitudes derived from different peoples' ability to percieve, recollect and apply different sets of stimuli better than others.