the intro:a.k.a-"the hand shake"
to some the most critical part of the song,
weather it be a dynamicaly inclined opening or a slap in the face.
either way you lok at it visual every opening to your songs as a curtain droping and an explostion of feeling.
its really the finest line of having someone clutched by ear or using their hand to turn off your song.
intros to me are like a funny story,if you fail to catch someones intrest with the biggining of a joke,you best get to the punch line asap.