Composing Music in the Cloud
Counterpoint Composer from a technical perspective
James L. Weaver
Developer / Evangelist
Twitter: @JavaFXpert
Email: jweaver@pivotal.io
http://JavaFXpert.com
http://CulturedEar.com
@JavaFXpert
Where we'll go today
Composing music algorithmically
- Examine about counterpoint music
- Demo/analyze CounterpointComposer
Composing music via machine learning
- Discuss machine learning
- Demo A.I. Duet
Live demo of CounterpointComposer chord analysis microservice while playing
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High-level architecture
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Source code is in GitHub:
- CounterpointService and Counterpoint Composer UI: https://github.com/JavaFXpert/counterpoint-service
- ChordAnalyzerService and Chord Analyzer Client:
Note: These Technical Presentation slides and Getting Started slides are available on the CounterpointComposer.com Help menu:
RESTful services & usage
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Exploring other music composition approaches
We'll come back to CounterpointComposer in a bit
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Other Music Composition Approaches
Music composition games popularized in 1800s
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Music Composition with Machine Learning
Pivotal Cloud Foundry now runs on Google Cloud Platform
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Definition of Machine Learning
"Machine learning is the science of getting computers to learn, without being explicitly programmed"
- Andrew Ng (co-founder of Coursera, Chief Scientist of Baidu)
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Anatomy of an Artificial Neural Network
Text
Modeled after the brain
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Artificial Neural Network
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Predicting/classifying an elephant
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Predicting/classifying a cat
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Time series prediction with neural networks
What is happening? What is most likely to happen next?
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This is a job for a Recurrent Neural Network
What is happening? What is most likely to happen next?
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Music composition with an RNN
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Predicting the most likely next note
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Playing a duet with neural networks
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Playing a duet with neural networks
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Now back to CounterpointComposer
Let's examine the ChordAnalyzerService
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Let's examine the ChordAnalyzerService
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Resource controller
http://example/analyze?notes=G3 D4 B4
Note: Because Jackson 2 is on the classpath, Spring’s MappingJackson2HttpMessageConverter is automatically chosen to convert the MusicChord instance to JSON
@RestController
public class ChordAnalyzerController {
private MusicChord musicChord;
@RequestMapping("/analyze") // endpoints s/b nouns, so analysis is a better name
public MusicChord identifyChordByNotes(@RequestParam(value = "notes") String notes) {
...
return musicChord;
}
}
To learn more, see Building a RESTful Web Service Spring Guide
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Resource representation
public class MusicChord {
private final String root;
private final String chordType;
private final String bassNote;
public MusicChord(String root, String chordType, String bassNote) {
this.root = root;
this.chordType = chordType;
this.bassNote = bassNote;
}
public String getRoot() {
return root;
}
public String getChordType() {
return chordType;
}
public String getBassNote() {
return bassNote;
}
}
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Make the app executable
package com.culturedear.chord;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ChordAnalyzerServiceApplication {
public static void main(String[] args) {
SpringApplication.run(ChordAnalyzerServiceApplication.class, args);
}
}
To learn more, see Building a RESTful Web Service Spring Guide
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App build/deploy cycle
$ mvn clean install
$ cf push
Note: One method of deployment for Spring Boot apps is a JAR file, which contains an embedded Tomcat servlet container.
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Pivotal Web Services Console
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start.spring.io
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Chord Analyzer Client
- http://chordanalyzerservice.cfapps.io/
- Leverages Web MIDI API (currently supported in Chrome)
- Use any MIDI keyboard controller
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Counterpoint Composer
from a technical perspective
James L. Weaver
Developer / Evangelist
Twitter: @JavaFXpert
Email: jweaver@pivotal.io
http://JavaFXpert.com
http://CulturedEar.com
http://CounterpointComposer.com
Hope you enjoyed
@JavaFXpert
Counterpoint Composer Technical Perspective
By javafxpert
Counterpoint Composer Technical Perspective
Exploring the technologies employed in Counterpoint Composer
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