Sound Onset labellizer
By P. Leveau, G. Richard

This software (Sound Onset Labellizer) is a computer program whose purpose is to manually put note onsets on .wav musical files (mono).

Details about this annotation software, freely distributed, is available in the paper: [pdf] P. Leveau, L. Daudet et G. Richard ,”Methodology and Tools for the evaluation of automatic onset detection algorithms in music”, International Symposium on Music Information Retrieval (ISMIR), Barcelone, Espagne, oct 2004.

The software can be downloaded at:

The software comes along with the small annotated database for onset detection that was part of the MIREX 2005 Onset detection task. The database is proposed with two labels sets: “” contains labels that have been validated by the 3 annotators but may miss some that are difficult to annotate precisely, and “” contains the onsets annotated by only one annotator.

Note that this software is governed by the CeCILL license under French law and abiding by the rules of distribution of free software. You can use, modify and/ or redistribute the software under the terms of the CeCILL license as circulated by CEA, CNRS and INRIA at the following URL “”.

Contact: Gaël Richard