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Melodic Search: Strategies and Formats

Melodic Search: Strategies and Formats . CS 275B/Music 254. On melody. What is a theme ? What is an incipit ? Are all themes incipits? Can you tell the key from a melody? Can you tell whether something you hear begins at the beginning? Is melody one-dimensional ?

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Melodic Search: Strategies and Formats

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  1. Melodic Search: Strategies and Formats CS 275B/Music 254

  2. On melody • What is a theme? • What is an incipit? • Are all themes incipits? • Can you tell the key from a melody? • Can you tell whether something you hear begins at the beginning? • Is melody one-dimensional? • How can we isolate a melody algorithmically? CS 275B Eleanor Selfridge-Field

  3. On melody • What is a theme? Significant content • What is an incipit? Beginning phrase • Are all themes incipits? • Can you tell the key from a melody? • Can you tell whether something you hear begins at the beginning? • Is melody one-dimensional? • How can we isolate a melody algorithmically? CS 275B Eleanor Selfridge-Field

  4. Non-musical search strategies CS 275B Eleanor Selfridge-Field

  5. Non-musical search strategies • Probability ranking • Sorting and categorization • String matching, edit distance • N-grams • Dynamic programming • Pattern detection CS 275B Eleanor Selfridge-Field

  6. Probability ranking “Query-by-humming”: work of Lloyd Smith et al, c. 1995. Example: MELDEX CS 275B Eleanor Selfridge-Field

  7. Melodic sorting (incipits) Examples from RISM [Ranking??] John Howard, "Strategies for sorting melodic incipits," CM 11 (1998). CS 275B Eleanor Selfridge-Field

  8. Edit distance: text • 1. Item-by-item comparison • 2. Penalties for • substitutions • insertions • deletions Bag Bat Cat Catch CS 275B Eleanor Selfridge-Field

  9. Edit distance (music) Ambiguities -iteration (accent invariant) -polyphonic involvement -decoration (accent invariant) CS 275B Eleanor Selfridge-Field

  10. N-grams Method Pick a string length Seek all its permutations Beethoven: Archduke Trio CS 275B Eleanor Selfridge-Field

  11. N-grams Music n-gram viewer http://www.peachnote.com/datasets.html CS 275B Eleanor Selfridge-Field

  12. Dynamic programming Examples: Jonathan Foote Performance-based self-similarity matrices Rhythmic similarity CS 275B Eleanor Selfridge-Field

  13. Pattern detection CS 275B Eleanor Selfridge-Field

  14. Pattern detection Settings of the word "Liebe" Nettheim: MuSearch (SCORE) • Pattern realms • Lyrics • Pitch • Duration • Phrase structure CS 275B Eleanor Selfridge-Field

  15. Vulnerabilities Query Target (scale degree): 32123 Pitch (scale-degree) matching without rhythmic, metric invariance CS 275B Eleanor Selfridge-Field

  16. Vulnerabilities Query Target: 3331 • Pattern-matching without: • Rests • Register considerations • Repeated notes CS 275B Eleanor Selfridge-Field

  17. Themefinder A search application for melodic data CS 275B Eleanor Selfridge-Field

  18. Themefinder Classical = themes Folk = incipits Renaissance = incipits CS 275B Eleanor Selfridge-Field

  19. Search examples …in decreasing order of precision http://www.themefinder.org CS 275B Eleanor Selfridge-Field

  20. Thought for the day • “The dictionary describes melody as a series of notes strung together in a meaningfulsequence.” Source: U.S. Patent application 20060254411 (Nov. 16, 2006) CS 275B Eleanor Selfridge-Field

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