Add the Radio Station Name to the Tagging information

When I tag a song, I would also like it to include the name of the Radio Station. Later, that will give me a rough idea of what type of music it is, and where to go to get more information, or hear it again. While you're there, it would also be nice to have a field for adding my own notes about the song (genre, how much I liked it, who else I think might like it, and so on).