CLAM-Annotator

The CLAM Music Annotator is a GPL tool that can be used to visualize, check and modify music information extracted from audio: low level features, note segmentation, chords, structure.

The tool is intended to be useful for the music information retrieval research whenever you need to:

-Supervise and correct the results of automated audio feature extraction algorithms.
-Generate manually edited annotations of audio as training examples or ground truth for those algorithms.