This is a prime example of the genre known as “dubstep” . The producers go by Digital Mysitikz (DMZ) but are individually known as Mala, Coki, and Loefah. They were extremely influential in the formative years of this genre in the early 2000’s .
As common throughout most dubstep songs, the beat is syncopated and slightly off tempo which creates atmosphere of extra space. You will also notice that there is very heavy bass. This type of music can only truly be appreciated through a set of high quality speakers with heavy emphasis on sub bass. This stems from the early influence of Jamaican dub sound system culture in the UK, where sound engineers were constantly equalizing the speakers during the show, tailoring it to each individual song. This same idea applies to dubstep shows.
This is a form of electronic music which makes it a bit difficult in describing the timbre since there are no traditional instruments being used. There is however, a lot of use of different types of percussion. Hand drums, and a regular drum kits are used throughout. There is a some string/violin use as well as what sounds like a distorted malled pad, and also another synth heard during the break down. There is heavy bass used which gives the driving pulse, as well as the vocal sample which is probably the strongest melodic element in this piece.
The texture of the song is homophonic and is written in a minor key, which creates a melancholic mood.