Please consider adding a feature to the 'About my system' in the Controller a count of tracks can be displayed and a used vs. remaining capacity % could be displayed.
1. This would allow Sonos owners to manage their own libraries
2. reduce cost for Sonos in removing unnecessary traffic to Support for such a trivial request allowing them to focus on more serious support issues
3. Remove the time and inconvenience for Sonos owners having to contact Sonos Support for a trivial request