An anthology of American folk music is like a book that has lots of different stories in it. But instead of stories, it has songs that people sang a long, long time ago in America. Folk music is like music that was passed down from generation to generation, so it's been around for a really long time.
The book is separated into different sections, each with a different type of folk music. For example, one section might have old songs people used to sing when they were working in the fields, and another section might have songs people sang when they were sad.
The book also comes with a special CD so you can listen to the songs while you read about them. It's a really cool way to learn about history through music!