File
New Playlist
Creates a new empty playlist, it's like a folder for your songs that you'd like to have play in a particular order, or just for organization.
New Preset Playlist
Pro: New Singer
Close Window
Is supposed to do what you expect, but probably doesn't.
Save Database
Only for the paranoid: The database automatically saves itself every few seconds whenever there is pending data to be saved. If you really want to force it to save *right now* then use this command.
Add to Library…
Rip Selected
Export
See Export Lite and Export Pro