[ddouglass]

To delete a song from the Playlist (main screen) highlight the song (left click on it and it will turn blue) then click on the delete button above the playlist. However I don't think this is what you are looking for.
The "Playlist" is the main screen list used to control what songs are played and in what order.
The Songs database is the listing of all your songs that you have imported into Hoster. To delete a single song or even a whole CD's worth of songs you use the Edit Songs under the Tools heading up top. Within that screen there is a delete button too, but this will delete the KMA file (which is what you are asking for) and remove it from the database as well.