Our dreams are firsthand creations, rather than residues of waking life. We have the capacity for infinite creativity; at least while dreaming, we partake of the power of the Spirit, the infinite Godhead that creates the cosmos.
Once you really get into a song, other than just listening to it, it forces you to go 'oh, they did this. I never would have thought of doing that,' when you deconstruct it. It's something you really can't do sometimes when you're just listening to a song. You have to really get into it.