'Tis the gift to come down where we ought to be,
And when we find ourselves in the place just right,
'Twill be in the valley of love and delight.
When true simplicity is gain'd,
To bow and to bend we shan't be asham'd,
To turn, turn will be our delight,
Till by turning, turning we come 'round right
~ Joseph Brackett
I love this music! You can learn about Aaron Copland and his work from the Copland House and from the Library of Congress' Aaron Copland Collection. Classical Net also has a list of recommended recordings of Copland's music (scroll down on their page).
Click here for a beautiful rendition of Copland's Fanfare for the Common Man performed by the U.S. Marine Band.
One more link: Classics for Kids: Aaron Copland