Concert is a web-based application for collaboratively organizing audio. It enables a group of musicians to upload recordings of small ideas or entire practices, and then remotely categorize and discuss these segments so that the ideas are already well-formed before the musicians actually discuss them in person.
It is built using Django, Backbone.js, as well as other dependencies.
The software is currently not in a release state, as it is being completely re-written. You can read about the development progress here: blog.concertsoundorganizer.org
Here is a recent mockup of the interface: