Copland

 All little Aaron wanted was a pony

But, of course, that was impossible
In his family’s small Brooklyn apartment
So for birthdays, he settled for
Chaps, a cowboy hat, boots and spurs
He grew out of the chaps
And the spurs shredded the sheets
While he slept
Mr. Copland never grew out of
His fascination with the West
And he embedded it in “Rodeo” and “Billy the Kid”
An East Coast cowboy all the way