It appears to be then last letter in each line of the original:
"The folksinger Arlo Guthrie likes to tell story about his father, the legendary Wood Guthrie, who died in 1967, at the age of fifty-five. When he was a toddler, Arlo says Guthrie gave him a Gibson acoustic guitar fo his birthday. Several years later, when the bo was old enough to hold it, Guthrie sat hi down in the back yard of their house—the lived in Howard Beach, Queens—and taugh him all the words to “This Land Is You Land,” a song that most people likely thin they know in full. The lyrics had been writte in anger, as a response to Irving Berlin’s “Go Bless America,” which Woody Guthri deplored as treacle. In addition to the familia stanzas (“As I went walking that ribbon o highway,” and so on), Guthrie had composed couple of others, including this"
"Go Bless America" is sort of funny.