Portions of the Pink Floyd song Echoes from the album "Meddle" (1971) play through the movie, specifically the sonar sounds section of the song. Additionally, leading to the fight on the docks to cut down the hanged man, the movie plays the opening to the Pink Floyd song One of These Days from the same album.
During the scene where Chan Kwong is running to find his wife and during the final battle, the main theme from Shaft (1971) plays in the background.
The Pink Floyd song "One of these Days" was used in the score during the scene where the hero cuts down the hanged body.