You should name the MP3-files on your disk in the following format: "Name_of_Artist_-_Name_of_song.MP3" Because the scan-process will read the file-name and put the artist and songname in the right coloumn.
You can visit MP3 Archive homepage at: http://home.sol.no/~vides/mp3arc/
You should NOT have special characters like ' or % or ? in the name or path of the song. When importing to the database these characters will be replaced with - .