It depends on what skin you are using. In the BMV2 skin that comes default with road runner, click "Music" on the main menu, and then the lower icon that looks like a page of text. This is the root of your music folder. Now click on the magnifing glass, and it will work the same as Frodo that you described. Put just the word "Night" and all songs with that word will be displayed.
Hope this helps!