Buttermilk Sky

Just what is meant by this phrase? And just what is Hoagy Carmichael’s song of the same name supposed to be about?

heroin.

i was joking about the heroin, of course. i wonder why no one else bothered to add anything.

Apparently it’s a type of cloud formation:

http://www.cloudman.com/atlas/atlas.htm

Ahh, Buttermilk Sky!

Thank you.

I suppose the deeper meaning of the song is that Hoagy Carmichael saw a “buttermilk sky” and it was just a hook to write a catchy tune.

As opposed to Paul McCartney’s “Vanilla Sky”