Fred Astaire sang it in a film, "A Damsel in Distress" (1937).
It was originally titled "A Foggy Day (In London Town)", and is often still referred to as such.
I was a stranger in the city Out of town were the people I knew I had that feeling of self pity What to do? What to do? What to do? The outlook was decidedly blue But as I walked through the dreary streets alone It turned out to be the luckiest day I've known
A foggy day, in London town Had me low, and it had me down I viewed the morning, with much alarm The British Museum, it lost its charm
How long I wondered, could this thing last? But the age of miracles, it hadn't past For suddenly, I saw you standing right there And in foggy London town, the sun was shining everywhere