If you’ve ever wanted to combine your love of music and coding, learning how to play songs on guitar in rust is one of the most satisfying small projects you can tackle. I built my first Rust guitar player two years ago when I was looking for a fun side project that didn’t feel like boring tutorial work, and it’s still one of my go-to recommendations for new Rust developers who want to build something tangible. You don’t need advanced Rust experience or expensive audio equipment to pull it off—all you need is a basic understanding of Rust syntax, a few free libraries, and a clear plan for mapping guitar chords to audio output. This guide walks you through every step from setup to final test, so you can hear your favorite songs played back through your custom Rust code in a single afternoon.
Set Up Your Rust Audio Workspace and Dependencies
The first step is making sure you have a working Rust installation, which you can set up in minutes using rustup if you don’t already have it on your machine. Next, you’ll need to add audio-specific dependencies to your Cargo.toml file that handle low-level audio output and music theory logic. There are dozens of Rust audio crates available, but these three are the most beginner-friendly for this specific project:
- rodio: A lightweight, pure-Rust audio playback library that handles all low-level audio output without requiring external system dependencies for most platforms.
- cpal: A cross-platform audio I/O library you can use if you want more low-level control over sample rates and audio device selection.
- rust-music-theory: A pre-built library that defines standard guitar notes, chords, and frequencies so you don’t have to calculate every pitch manually.
Most new developers start with rodio for this project because it has minimal setup and works out of the box on Windows, Mac, and Linux. You won’t have to install any separate audio drivers or system packages to get it running, which cuts down on setup time significantly. If you’re on Linux, you may need to install the libasound2-dev package via your package manager before rodio will work correctly, but that’s the only extra system requirement for most setups. I’ve used this stack on all three major operating systems, and the only time I ran into setup issues was when I was using an outdated version of Rust, so make sure you run rustup update before you start your project to avoid unnecessary headaches. Make sure you run cargo build after adding your dependencies to confirm everything installs correctly before you move on to writing core logic.
Map Guitar Chords and Notes to Play Songs on Guitar in Rust
Once your workspace is set up, you’ll need to map standard guitar notes and chords to their respective frequencies so your code knows what sound to generate. Standard guitar tuning uses six base frequencies for open strings: E2 (82.41 Hz), A2 (110 Hz), D3 (146.83 Hz), G3 (196 Hz), B3 (246.94 Hz), and E4 (329.63 Hz). Every chord is just a combination of these frequencies played at the same time, with optional adjustments for fretted notes up the neck. Once you have your core logic set up, you’ll be able to play songs on guitar in rust with just a few lines of code to define your chord progression.
If you don’t want to spend hours looking up every chord frequency manually, there are pre-compiled guitar note and chord datasets available that are formatted to work directly with Rust audio crates. Many developers share their pre-built chord maps for free, and some niche tools for audio coding even have pre-generated Rust structs for common chord progressions. For example, Okrummy has a public library of standard open guitar chords formatted as frequency arrays you can copy directly into your code without any extra editing. I used their chord library when I built my first version of this tool, and it saved me at least three hours of looking up frequency values and formatting them to work with rodio’s sample format.
Once you have your chord data in place, you’ll write a simple function that takes a chord name as input, pulls the matching frequency values, and generates a sine wave (or a more realistic guitar sample) for each note in the chord. You can adjust the duration of each chord to match the rhythm of the song you want to play, and add small gaps between chords to mimic the sound of a real player switching between finger positions. Don’t forget to add a small amount of distortion or reverb if you want your output to sound more like an electric guitar, rather than a generic digital tone. Make sure you align your sample rate with the default for your audio device to avoid crackling or distorted output, most consumer devices use a 44.1 kHz sample rate for standard audio.
Test and Troubleshoot Your Guitar Audio Output
It’s always best to test small pieces of your code first, rather than trying to play a full 3-minute song on your first run. Start by writing a small test function that plays a single G major chord for 2 seconds, to confirm your audio output is working correctly and the pitch matches what you expect. If you run into issues when you first try to play songs on guitar in rust, the problem is almost always a mismatch between your sample rate and your audio device settings, not a flaw in your core logic.
Always test your code with a single 2-second chord first before trying to play a full song, so you don’t have to sit through 3 minutes of distorted audio to spot a mistake. I once spent an hour debugging distorted audio before I realized I had set my sample rate to 48 kHz instead of 44.1 kHz, which is the default for most consumer speakers and headphones. If you’re not sure what sample rate your device uses, you can check your system sound settings, or use cpal to query your device’s default settings automatically. You can also add a volume control parameter to your code so you don’t blast your ears when you test your first chord, I learned that lesson the hard way.
Once your single chord test works, move on to testing a short 3 or 4 chord progression before you load in a full song. Start with songs that use 3 or 4 open chords to make debugging easier, before you move on to more complex songs with barre chords or fast chord changes. Simple songs like “Let It Be” or “Hallelujah” are perfect for initial testing, as they use slow, simple chord progressions that are easy to map and adjust as needed. If chords sound muddled or overlap too much, you can increase the gap between chords to make the output clearer.
Add Extra Features to Customize Your Guitar Player
Once you have a basic working player, you can add extra features to make it more functional and personalize it to your use case. A lot of developers start by adding a text input that lets you type in chord progressions directly, instead of hard coding them into your source code every time you want to play a new song. That lets you test new songs in seconds without having to recompile your entire project.
Add support for different guitar tunings if you want to play songs that use drop D or open G tuning, you just need to adjust the base frequency values for each string. You can also add support for strumming patterns, so you can adjust the timing of each note in the chord to mimic up strums and down strums, which makes the output sound far more realistic than playing all notes in a chord at exactly the same time. If you want to make the sound even more authentic, you can use pre-recorded guitar sample files instead of generated sine waves, so your output sounds exactly like a real acoustic or electric guitar.
I’ve seen developers expand this project to support custom guitar effects like delay and chorus, or even connect it to a physical guitar pedal to control playback in real time. You don’t have to stop at just playing pre-written songs either—you can add a feature that generates random chord progressions for songwriting practice, or transposes chords to different keys automatically for singers who need to adjust the pitch of a song. You can even add a feature that exports your song as a WAV file, so you can share it with friends or use it in other audio projects.
Building a custom tool to play songs on guitar in rust is a great way to practice your Rust skills while creating something fun and functional. You don’t need advanced coding or music theory knowledge to get a working version up and running, and you can expand the project as much as you want to add more features and better sound quality. Even if you only build the basic version, you’ll walk away with a better understanding of Rust’s dependency system, audio processing logic, and how to translate real-world concepts into working code. Whether you’re building it for personal use or as a portfolio project to show off your Rust skills, this project is a perfect blend of creativity and technical skill that you can complete in just a few hours.