Have you seen Rachel Getting Married? (warning:spoiler)

If so, would you – could you explain the choice of the Neil Young song that Sidney sang to Rachel at the wedding? It was very charming that he sang, I just didn’t “get” the song choice as the words didn’t seem to be particularly descriptive of her. What was the significance of the indian themed wedding? Finally, do you think that Kyms choice to return to rehab was a wise one, having already been there for 9 months? These, my friends, are the things that I ponder. Great movie, very insightful and saved me $150. for an hour of therapy!