Purpose of the opening of a film - untouchables

The extract starts off with a violin playing a sharp note and a final bang of a drum, this makes the audience recognise when the film is starting. This loud bang is played when the title of the film comes on the screen.
there is then silence whilst the storyline of the movie comes onto the screen. This gives the audience an idea of the background idea of the movie. The film titles gives the background information of the 1930's in Chicago. this links very well into the next scene we see from the film where the bar explodes.
This is accompanied by a high angle shot of Al Capne and his interviewers and servants in an enclosed room.
Diegetic sounds of the characters conversing with each other are then heard. We can tell who the main character is because he is the centre of attention, centred in the middle of the room by servants and interviewers. But although the cameras are in a high angle it suggests because he is beneath the camera, that he should be in Hell, as his character is a villain. The camera then zooms in to a mid shot of Al Capone whilst he is getting his beard razored. When the barber draws blood accidently from Al Capone's face, we see from the facial expressions, who is of a higher status. Already from these factors within the film we can identify that the film may be a gangster type film, with a lot of violence.