After listening to all entries, I learned that happy-aimed-songs have huge tendency to irritate me. I'm sorry, but this is what it is. I think Shrikant's entry was the only one, I found relevant to the theme and not having any annoying element. There were some fine tunes, like DH Miltz's or Robojam's, which I find not irritating at all, but not happy-relevant either. Conclusion, don't do it again. Please.