Acoustica MP3 CD Burner will automatically search your hard drive for songs on your computer. If it finds a new song, it adds it to the "Music Library".
When you search for a song via the "Find" tab, it will first search your Music Library. After that, it will start a "Sound Scan" and scower your computer for new songs. It will search in certain directories or your whole computer. Click "Preferences" from the "File" menu and select "Sound Scan" to change the way and order that the software will scan for new songs.