Yesterday is but a dream, tomorrow but a vision.

Yesterday is but a dream, tomorrow but a vision. But today well lived makes every yesterday a dream of happiness, and every tomorrow a vision of hope. Look well, therefore, to this day. Life Is Colorful

Its not the song but the memories which makes you sad

Being happy doesn't mean everything's perfect

"Being happy doesn't mean Everything's perfect.. It just means we have decided to see Everything beyond The imperfections"