The Tunatic database is maintained by the Tunatic community itself through a program called Tunalyzer. Tunalyzer (when installed and enabled) scans your computer for music. When it finds a song that is not in Tunatic's database yet, it analyzes it and sends its audio fingerprint and metadata (title, artist, etc.) to the Tunatic server. Thus, that song can later be identified by other Tunatic users.