Lyric discussion by ufotofu9 

Cover art for So Much to Say lyrics by Dave Matthews Band

Believe it or not, we spent a whole day in a college course on Child Developement disussing this song. Although certain parts may mean different things to different people (and some of my interpretations may be a stretch), the main gist of the song is the gradual developement of a child into a thinking, speaking individual.

      I say my hell is the closet I’m stuck inside
      Can’t see the light

Is a reference to being trapped inside the womb, with

         ...my heaven is a nice house in the sky
         Got central heating and I’m alright

representing the exit from the womb.

      Keep it locked up inside don’t talk about it...
    Open up my head and let me out, little baby

Refers to baby's frustration at not being able to communicate yet.

Now, once baby reaches speaking age--and of course Dave Matthews, being a "deep" musical artist, talks about the shallowness of one's conversations once we can speak, despite baby's earlier yearning to communicate, having had "so much to say." And what does baby talk about when he can finally speak?--after he had, "so much to say?" and was stuck in his own "hell" of muteness? The bloody weather! And not just that, but other mundain topics over and over again, as represented by the lyrics

 Here we have been standing for a long, long time
 Treading trodden trails for a long, long time

The "trodden trails" (Nice alliteration by the way) are topics that have been disussed ad neaseum. Basicaslly, nobody has anything new to say, making Dave Matthew's repetitious chorus "so much to say" all the more ironic.

Pretty clever song for an ex bartender who never went to college.