Book of Forever

When I work, sometimes I listen to my local public radio station. I will jot down the name of an artist whose song I liked, or an author being interviewed. Today I sat down at my work table and saw this note that I made, I don't know when. "9.20 Book of Forever" I don't know what it is. I don't know what it means. I don't know why I wrote it down, but it even got a circle around it.