 No songwriter or composer name may be indicated for old folk music, traditional songs in genres such as blues and bluegrass, and very old traditional hymns and spirituals, because for this music, the authors are often unknown; in such cases, the word "Traditional" is often placed where the composer's name would ordinarily go.Title pages for songs may have a picture illustrating the characters, setting, or events from the lyrics.Title pages from instrumental works may omit an illustration, unless the work is program music which has, by its title or section names, associations with a setting, characters, or story.