Need help identifying this Aaron Copland piece
 

Dear music fans,
I have a poor quality recording of a solo piano piece by Aaron Copland,
but I don't know the title. I'd love to find out what it is so I can buy
a high quality recording.
The intro is quite distinctive and I'm hoping someone might recognize it.
You can hear the first minute of the piece at the URL in the attached image.

Thanks for any assistance you can offer.
--b