Summary: David sings God's praises because He created and cultivates the world and everyone in it. Not only is He in charge of little details in Earth's physical makeup, but He guides each heart.
Response: I'm a musician, and sometimes my mind will do what animators call "Mickey Mousing," where a song will fit into the scenario in question. But my brain will tend to focus on a song's technical aspects before the lyrics, which kind of defeats the purpose. I guess what I'm saying is, I hope to have given more control up in what/how I think so God can give me more focus.