Folders suddenly empty. Says "No song" but memory still filled up

No connections to the computer, or any charging medium, prior to the error.

Last time around, I turned it on to listen, but got a phone call, so it auto-powered off.  When I turned it on, the flower icon stayed on a bit longer than normal, and when attempting to resume listening (or even choose anything else, after that failed), navigating to any option off the Music option, showed “Empty”.

Going to properties showed the space still in use by the clip, but they were unviewable.  Soft reset did not resolve the issue.  Connecting to a PC showed the directories to be empty as well, but the space in “Properties” showed in use.  I had about 3Gb on a 4Gb clip.