{"id":227,"date":"2016-05-10T15:22:21","date_gmt":"2016-05-10T15:22:21","guid":{"rendered":"http:\/\/www.rangakrish.com\/?p=227"},"modified":"2016-05-10T15:25:42","modified_gmt":"2016-05-10T15:25:42","slug":"generating-melody-to-fit-harmony","status":"publish","type":"post","link":"https:\/\/www.rangakrish.com\/index.php\/2016\/05\/10\/generating-melody-to-fit-harmony\/","title":{"rendered":"Generating Melody to Fit Harmony"},"content":{"rendered":"

There are two common approaches to composing music. One involves synthesizing a suitable chord progression first and then layering melody over it. The other is to start with melody and then harmonize it by applying chords. Of course, you can mix both approaches – use one technique for a portion of the song and then another for other portions. Remember, this is art, and hence nothing is cast in stone.<\/p>\n

I have two objectives in this post:<\/p>\n

1) Describe a simple technique for deriving melody based on the chord progression. We will use both Chord Tones and Non Cord Tones (but in the same scale – diatonic).<\/p>\n

2) Play the generated music through Ableton Live<\/a> using its rich instrument collection.<\/p>\n

In many cases, we might want the melody to be at a higher octave than the chord progression, so this octave shift is passed as an argument to our algorithm. We also assume that the chords are in a specific scale, and hence diatonic.<\/p>\n

Here are the steps:<\/strong><\/span><\/p>\n

1) Given a chord progression, for each bar: find the pitches of the chord, remove duplicates and sort the pitches in ascending order.<\/p>\n

2) Since the melody must be from the same scale (but shifted by some octave), expand the scale to determine its pitches and derive a sequence of pitches {-1, 0, +1} octaves apart.<\/p>\n

3) Taking the pitches obtained in (1), determine a sub-sequence from (2) that covers both chord and non-chord tones.<\/p>\n

4) Take as many consecutive elements as possible from (3) based on the melodic rhythm for that bar.<\/p>\n

5) Apply a pitch-shaper function randomly on the sequence obtained in (4)<\/p>\n

Let us take a simple example and work through the steps. Suppose the first bar has the chord c3e3g3<\/strong>\u00a0(i.e., Tonic in c3 major scale). We will assume that we need the melody in 4th octave, not 3rd, but in the same scale.<\/p>\n

1) We get (c4 e4 g4) from the first chord<\/p>\n

2) The allowed pitches for this scale after extended transpositions will be:<\/p>\n

(c3 d3 e3\u2026c4 d4 e4 f4 g4 a4 b4 c5 d5 e5 \u2026)<\/p>\n

3) We get (c4 d4 e4 f4 g4) as the largest sub-sequence in (2)<\/p>\n

4) If our melodic rhythm for this bar is \u2018(q -e e q q), we need 4 pitches, so we select a random subset of (3), say, (d4 e4 f4 g4)<\/p>\n

5) Applying a random pitch shaper function, we might get the sequence (d4 e4 g4 f4) as the final melody for this bar<\/p>\n

We repeat the above steps for all the bars.<\/p>\n

As you can see, the core logic is straightforward. The code I have uploaded has many functions (distributed over 3 source files), including some utility functions from my own library, so that you will be able to test the entire implementation without other dependencies.<\/p>\n

\"Melody<\/a>
Melody Over Harmony<\/figcaption><\/figure>\n

Let us now come to the second part of this post: How to connect Opusmodus to Ableton Live? By the way, the only reason I wanted to connect to Live was the rich set of instruments available in Live compared to the GM. In an earlier article<\/a>, I showed\u00a0how to connect OM to Reaktor, so connecting to Live itself is simple.<\/p>\n

I have included the screenshot of Live instrument setup, so that you can see what instruments I have used in different tracks. Make sure you configure the input Bus correctly for each of the tracks.<\/p>\n

\"Ableton<\/a>
Ableton Live 9 Setup<\/figcaption><\/figure>\n

I also recorded the playing (by arming the tracks) and exported the song as a WAV file. You can download<\/a>\u00a0it and listen to the generated song. One advantage of using an external environment such as Ableton Live is that when you playback, you can add other effects to soup up the song. In my case, that was not the intention, so I let go at the basic step.<\/p>\n

Here<\/a>\u00a0is the source code (zipped).<\/p>\n

If you want to use the GM set in stead of Live, remove the ports from the def-score<\/strong><\/em>\u00a0and include the conventional parameters instead.<\/p>\n

I would love to hear about your own techniques, if you have tried any, for layering melody on top of harmony.<\/p>\n","protected":false},"excerpt":{"rendered":"

There are two common approaches to composing music. One involves synthesizing a suitable chord progression first and then layering melody over it. The other is to start with melody and then harmonize it by applying chords. Of course, you can mix both approaches – use one technique for a portion of the song and then […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18,5,17],"tags":[57,56,55],"class_list":["post-227","post","type-post","status-publish","format-standard","hentry","category-lisp","category-music","category-programming","tag-ableton-live","tag-harmony","tag-melody"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9OLnF-3F","jetpack-related-posts":[{"id":2224,"url":"https:\/\/www.rangakrish.com\/index.php\/2020\/12\/06\/using-falcon-2-with-opusmodus\/","url_meta":{"origin":227,"position":0},"title":"Using Falcon 2 with Opusmodus","author":"admin","date":"December 6, 2020","format":false,"excerpt":"The recently concluded Black Friday sale by UVI\u00a0was an irresistible temptation for me and I ended up investing in Falcon 2 and a few other instruments. 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I had downloaded the library some time ago, but could not spend much time since my primary focus\u2026","rel":"","context":"In "LISP"","block_context":{"text":"LISP","link":"https:\/\/www.rangakrish.com\/index.php\/category\/lisp\/"},"img":{"alt_text":"Simple Java Program","src":"https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2020\/12\/java-2-300x142.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2020\/12\/java-2-300x142.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2020\/12\/java-2-300x142.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":2206,"url":"https:\/\/www.rangakrish.com\/index.php\/2020\/11\/22\/a-library-for-algorithmic-music-composition\/","url_meta":{"origin":227,"position":3},"title":"A Library for Algorithmic Music Composition","author":"admin","date":"November 22, 2020","format":false,"excerpt":"I have recently started implementing a library for algorithmic music composition. 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