Implementation of the MusicXML specification in Swift

Swift Musical eXtensible Language

This package is a fork of the original dn-m/MusicXML.

Swift Version Platforms

A Work-In-Progress implementation of the musicXML specification in Swift.

The goal of this project is to allow Swift users to read, manipulate, and write musicXML files in a richly-typed manner on any platform supported by Swift.

Hello, world!

Let's construct the "Hello, world!" score example from the musicXML documentation. This musical composition consists of one measure that contains a whole note on middle C, based in 4/4 time.

Graphical Representation

When rendered graphically, this score example should look something like this:


XML Representation

The musicXML representation looks like this:

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <!DOCTYPE score-partwise PUBLIC
        "-//Recordare//DTD MusicXML 4.0 Partwise//EN"
    <score-partwise version="4.0">
        <score-part id="P1">
      <part id="P1">
        <measure number="1">

MusicXML Representation

To construct the "Hello, world!" example in Swift looks like this:

let note = Note(
    pitch: Pitch(step: .c, octave: 4), 
    duration: 4, 
    type: .whole
let key = Key(fifths: 0)
let time = Time(4,4)
let clef = Clef(sign: .g, line: 2)
let attributes = Attributes(
    divisions: 1,
    keys: [key],
    times: [Time(
                beats: ["4"],
                beatType: ["4"]
    clefs: [clef]
let measure = Partwise.Measure(
    number: "1",
    musicData: [
let part = Partwise.Part(id: "P1", measures: [measure])
let header = Header(
    partList: [
        .part(ScorePart(id: "P1", name: "Music"))
let traversal = Partwise(header: header, parts: [part])
let score = Score.partwise(traversal)

🧬 Decoding musicXML into a Score

You can decode a Score in a variety of ways:

let fromData = try Score(data: data)
let fromString = try Score(string: string)
let fromURL = try Score(url: url)

🚧 Work-in-progress: Encoding a Score into musicXML

Pre-release version 0.3.0 will see the completion of the encoding from a Score into the musicXML format.

Getting Started


Use the Swift Package Manager to include the SwiftMXL module into your project.


To contribute to the SwiftMXL package, clone the git repository:

git clone git@github.com:Treata11/SwiftMXL.git && cd SwiftMXL

Build the package:

swift build

Run the tests:

swift test

If you use Xcode:

open package.swift or simply xed .

Development Roadmap

The upcoming pre-release versions will be focused on completing different tasks.


Pre-release version 0.3.0 will be defined by completing the implementation of the encoding of abstract musical content. The LilyPond Test Suite tests will be transformed into round-trip tests to ensure that the plumbing is clean.


Pre-release version 0.4.0 will be defined by refining the public interfaces exposed by the SwiftMXL package. Up until this point, public initializers may be somewhat clumsy.

More Resources

See the MusicXML XSD Schema Reference for more information about how MusicXML is structured.


  • Swift Tools 5.0.0
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Last updated: Wed Apr 03 2024 04:24:01 GMT-0900 (Hawaii-Aleutian Daylight Time)