

Program notes introduce the audience to works to they might not know and to understand the works in greater depth if they are already somewhat familiar with them.
Certainly, at the college level the performer is expected to write the program notes. When they submit them for approval varies. Sometimes high school juniors or seniors write their own, with help from their teachers.
Ask if there are guidelines to follow.
If you are playing all movements of a multi-movement work (sonata) or some from a collection (Bach French Suite), you must write about all movements separately.
You want to "set the stage" with some information that helps the listener to "place" the piece chronologically; and to compare it to the composer's other pieces. Then you discuss the form of the piece and how the composer uses the basics of construction and harmonic movement; and how he makes changes. Big changes or small ones? What are the result of these changes? In this piece? In subsequent pieces? In pieces by later composers?
This "consumer information" is a hook to the reader to journey with you into more detail.
For each movement or piece:
Overall:
Add any other personal observations made while learning the piece.
Your teacher or professor probably will have other suggestions or requirements.
Everything you read on the Internet may not be true - remember that nobody checks that whatever someone puts up is correct, for example, in Wikipedia. Use this resource with care; try to corroborate from another source. Be careful, however, even in this, as often one source will copy directly - word for word, even! - from another site. So, you find the same material on several sites, attributed to several authors, all of which has been copied from one site and is therefore useless for purposes of corroboration.
I could write about nuclear physics, about which I know nothing, and you wouldn't have any idea I knew nothing if you also knew nothing and were trying to find out about nuclear physics!
That's why it's vital to go to traditional, reliable sources that are backed by excellent scholarship by proven experts and have been read and corrected by numerous other excellent scholars.
Grove's Dictionary of Music
Harvard Dictionary of Music
Baker's Dictionary of Music and Musicians
Music in Western Civilization (Lang) This is a general music history book, but a good source for information to use for "setting the stage."
There are many other music history texts. Also see specific resources for the period in question: Music in the Middle Ages (Reese), Music in the Renaissance (Reese), Music in the Baroque Era (Bukofzer), Baroque Music (Palisca), Performance Practices in Classical Piano Music (Rosenblum), and so on.
Pianist's Guide to Standard Teaching and Performance Literature (McGrath) This is
primarily a resource guide for teachers, but you can get dates and some general information from it.
Be careful, also, about introductory material in your music books. We hope that it was written by an excellent scholar, but sometimes we don't know who wrote it. Sometimes it's someone we've never heard of. (Maurice Hinson is always reliable.) Be particularly wary of commentary on Bach; better to go to Grove's.
Again, your teacher/professor will have other suggestions for resources.
copyright 2009, Martha Beth Lewis, Ph.D.
Contact me for reprint permission.
marbeth@marthabeth.com