The Sound Guy has released , an application that searches the user's iTunes collection and automatically creates a new playlist of all the songs whose lyrics contain specified words or phrases. PlayLyrix can be used to create playlists of songs with lyrics that reinforce a wide range of moods or themes. "After creating a new iTunes playlist, PlayLyrix will also create a list of songs containing the specified lyrics, including songs that are not in the user's iTunes library [with links to the iTMS for purchase]." PlayLyrix is available for $5. It requires Mac OS X 10.3 or later and iTunes 4.5 or later.