The Parsons code, formally named the Parsons Code for Melodic Contours, is a simple notation used to identify a piece of music through melodic motion—the motion of the pitch up and down. Denys Parsons developed this system for his 1975 book, The Directory of Tunes and Musical Themes. Representing a melody in this manner makes it easy to index or search for particular pieces.
The book was also published in Germany in 2002 and reprinted by Piatkus as The Directory of Classical Themes in 2008.
The code 
The first note of a melody is denoted with an asterisk (*), although some Parsons code users omit the first note. All succeeding notes are denoted with one of three letters to indicate the relationship of its pitch to the previous note:
- u = "up," if the note is higher than the previous note
- d = "down," if the note is lower than the previous note
- r = "repeat," if the note is the same pitch as the previous note
- * = first tone as reference
Some examples 
Tune for Twinkle Twinkle Little Star
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- "Twinkle Twinkle Little Star": *rururddrdrdrd urdrdrdurdrdrd drururddrdrdrd
- "Silent Night": *udduuddurdurdurudddudduruddduddurudduuddduddd
- "Love Me Tender": *uduududdduu
- "White Christmas": *udduuuu
- First verse in Madonna's "Like a Virgin": *rrurddrdrrurdudurrrrddrduuddrdu
- First verse in "We Are the World": *rduduururdrddrududuu
- "The Parsons Code for Melodic Contours". Musipedia.
- Parsons, Denys (1975). The Directory of Tunes and Musical Themes. S. Brown. ISBN 0-904747-00-X.
- Parsons, Denys (2002). The Directory of Tunes and Musical Themes. Bohmeier. ISBN 3-89094-370-5.
- Parsons, Denys (2008). The Directory of Classical Themes. Piatkus. ISBN 978-0-7499-5178-8.
- Themefinder allows searching musical themes by Parsons Code (called "Gross Contour" on the search page).
- "The Open Music Encyclopedia" uses Parsons code for encoding songs in their database
- FolkTuneFinder.com uses Parsons code (amongst other methods) to search a database of folk tunes.