Night and day Cole Porter is the one.

Night and day you are the one

Only you beneath the moon and under the sun

Whether near to me or far

It's no matter darling where you are

I think of you

Night and day, day and night, why is it so

That this longing for you follows wherever I go

Sing a happy song today in honor of Cole Porter, born on this day in in 1891.  Better yet, here's a link to Ella Fitzgerald singing Night and Day.   http://www.youtube.com/watch?v=PEM_63_P0CY  Just try to spend the rest of your day NOT humming it.