I am writing my master's thesis on Music Information Retrieval and Visualisation of music collections. In order to visualise a collection of music tracks, I am looking for an appropriate (and preferably free/open source) clustering tool.
A functionality that is essential for my research goals is the ability to visually represent the clusters and make that visualisation interactive for the user. Examples of this interactivity could include: focus on a specific cluster, expand a cluster when clicking on it to show what's inside, show links between different tracks depending on which track is selected etc.
If the tool includes functionality to show the data in some other way except clusters (e.g. timelines, geographical map), that would be a great plus.
I hope some of you guys can help me.