Nowadays, music fans are beginning to massively use mobile digital music players and dedicated software to organize and play large collections of music. In this context, users deal with huge music libraries containing thousands of tracks. Such a huge volume of music easily overwhelms users when selecting the music to listen or when organizing their collections. Music player software with visualizations based on textual lists and organizing features such as smart playlists are not really enough for helping users to efficiently manage their libraries. Thus, we propose new graphical visualizations and their associated features to allow users to better organize their personal music libraries and therefore also to ease selection later on.