Basic Pitch is a Python library for Automatic Music Transcription (AMT), using lightweight neural network developed by Spotify's Audio Intelligence Lab. It's small, easy-to-use, pip install-able and npm install-able via its sibling repo.
Basic Pitch may be simple, but it's is far from "basic"! basic-pitch is efficient and easy to use, and its multipitch support, its ability to generalize across instruments, and its note accuracy competes with much larger and more resource-hungry AMT systems.
Provide a compatible audio file and basic-pitch will generate a MIDI file, complete with pitch bends. Basic pitch is instrument-agnostic and supports polyphonic instruments, so you can freely enjoy transcription of all your favorite music, no matter what instrument is used. Basic pitch works best on one instrument at a time.
If you use this library in academic research, consider citing it:
bibtex
1@inproceedings{2022_BittnerBRME_LightweightNoteTranscription_ICASSP,
2 author= {Bittner, Rachel M. and Bosch, Juan Jos\'e and Rubinstein, David and Meseguer-Brocal, Gabriel and Ewert, Sebastian},
3 title= {A Lightweight Instrument-Agnostic Model for Polyphonic Note Transcription and Multipitch Estimation},
4 booktitle= {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
5 address= {Singapore},
6 year= 2022,
7}
Note that we have improved Basic Pitch beyond what was presented in this paper. Therefore, if you use the output of Basic Pitch in academic research,
we recommend that you cite the version of the code that was used.
Demo
If, for whatever reason, you're not yet completely inspired, or you're just like so totally over the general vibe and stuff, checkout our snappy demo website, basicpitch.io, to experiment with our model on whatever music audio you provide!
Installation
basic-pitch is available via PyPI. To install the current release:
pip install basic-pitch
To update Basic Pitch to the latest version, add --upgrade to the above command.
Compatible Environments:
MacOS, Windows and Ubuntu operating systems
Python versions 3.7, 3.8, 3.9, 3.10
For Mac M1 hardware, we currently only support python version 3.10. Otherwise, we suggest using a virtual machine.
Usage
Model Prediction
Command Line Tool
This library offers a command line tool interface. A basic prediction command will generate and save a MIDI file transcription of audio at the <input-audio-path> to the <output-directory>:
Optionally, you may append any of the following flags to your prediction command to save additional formats of the prediction output to the <output-directory>:
--sonify-midi to additionally save a .wav audio rendering of the MIDI file
--save-model-outputs to additionally save raw model outputs as an NPZ file
--save-note-events to additionally save the predicted note events as a CSV file
To discover more parameter control, run:
basic-pitch --help
Programmatic
predict()
Import basic-pitch into your own Python code and run the predict functions directly, providing an <input-audio-path> and returning the model's prediction results:
<minimum-frequency> & <maximum-frequency> (floats) set the maximum and minimum allowed note frequency, in Hz, returned by the model. Pitch events with frequencies outside of this range will be excluded from the prediction results.
model_output is the raw model inference output
midi_data is the transcribed MIDI data derived from the model_output
note_events is a list of note events derived from the model_output
predict() in a loop
To run prediction within a loop, you'll want to load the model yourself and provide predict() with the loaded model object itself to be used for repeated prediction calls, in order to avoid redundant and sluggish model loading.
If you would like basic-pitch orchestrate the generation and saving of our various supported output file types, you may use predict_and_save instead of using predict directly:
directory paths for basic-pitch to read from/write to.
<save-midi>
bool to control generating and saving a MIDI file to the <output-directory>
<sonify-midi>
bool to control saving a WAV audio rendering of the MIDI file to the <output-directory>
<save-model-outputs>
bool to control saving the raw model output as a NPZ file to the <output-directory>
<save-notes>
bool to control saving predicted note events as a CSV file <output-directory>
Model Input
Supported Audio Codecs
basic-pitch accepts all sound files that are compatible with its version of librosa, including:
.mp3
.ogg
.wav
.flac
.m4a
Mono Channel Audio Only
While you may use stereo audio as an input to our model, at prediction time, the channels of the input will be down-mixed to mono, and then analyzed and transcribed.
File Size/Audio Length
This model can process any size or length of audio, but processing of larger/longer audio files could be limited by your machine's available disk space. To process these files, we recommend streaming the audio of the file, processing windows of audio at a time.
Sample Rate
Input audio maybe be of any sample rate, however, all audio will be resampled to 22050 Hz before processing.
Contributions to basic-pitch are welcomed! See CONTRIBUTING.md for details.
Copyright and License
basic-pitch is Copyright 2022 Spotify AB.
This software is licensed under the Apache License, Version 2.0 (the "Apache License"). You may choose either license to govern your use of this software only upon the condition that you accept all of the terms of either the Apache License.
Unless required by applicable law or agreed to in writing, software distributed under the Apache License or the GPL License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache License for the specific language governing permissions and limitations under the Apache License.
