Till I Die by the Beach Boys. A very sobering, beautiful, yet dark song that Brian wrote about the smallness of one person and the vastness of the universe. He ponders how long he'll be such a small object being moved by forces beyond his comprehension, and the conclusion he draws is well... more like a hopeless realization if anything, though I do still enjoy the song for its musical brilliance and beautiful complexity. Really captures the mood he was in at the time; a dark and lonely place indeed.