From the second disc's [Main Menu] select the [About The Cas menu entry, and from there go to Tony Leung Chiu-Wai's entry. On the first page of his biography press the [Up] arrow key on your remote control to highlight a music note. Now press the [Enter] key and you will see a music video for Tony Leung's song [Hua Yang Nian Hua] that was directed by Wong Kar-Wai.
Bonus Trailers
Also on the second disc you should go to the [Wong Kar-Wai: The Searcher] section. Here you will find detailed notes about the director's career, complete with hidden trailers for "Ashes Of Time", "Fallen Angels", "Happy Together" and "In The Mood For Love". All you need to do to access them is to go through the various pages of information and at the end of each section the according trailer will play.
Music & Sound Effects Track
Select [About the Music] in the disc's [Main Menu] and then select [Musical Themes]. A list of music titles appears with Chinese numerical indices. Select the indices and you will have the chance to see the corresponding scenes with the music only.