Opening sequence to Sherlock Holmes.

The opening sequence in Sherlock Holmes starts off with some tinkly piano music. This could be described as theme music for Sherlock Holmes. 
This is followed by the sound of horses and carts with their chains clinking. These are diegetic sounds as they appear in the film.
A voice over appears next which gives an insight into what a character is thinking. This is non diagetic.
The sound of a gun would be classed as non diagetic or selective sound as it is enhanched in post production.
The sound effects are also non daigetic as they are added afterwards.
However the breathing, chanting and the dialogue are all diagetic as they are recoreded whilst filming as they are in the scene.
The background music changes pace and volume during this scene. It starts off loud and gets faster to build tension when the horses or Sherlock Holmes are running. It drops right down when there is either  VO or dialogue. Different music which is a lot deeper and slower comes when we are introduced to Lord Blackwood.