P900: Cannot delete an audio file

Just bought the P900. When I opened the Music Player, I found a song called
Two Princes that I did not like. I went to File Manager to delete it, but
this song was not listed there.

I then put the P900 on the SyncStation, boot up the My P900 PC to Phone
software. Again I failed to see this pesky song anywhere- not in any of the
folders under Phone Memory nor Memory Stick. Where in the world is this
song hidden?

Thks for your help and Merry Christmas!