Dub

Dub is a music genre, evolved from reggae, that involves revisions of existing songs. The dub sound consists predominantly of instrumental remixes of existing recordings and is achieved by significantly manipulating and reshaping the recordings, usually by removing the vocals from an existing music piece, emphasizing the drum and bass frequencies or 'riddim', adding extensive echo and reverb effects, panoramic LR delay, and dubbing occasional snippets of lyrics or instruments from the original version.

It is widely accepted that Jamaican producers Osbourne "King Tubby" Ruddock, and Lee "Scratch" Perry pioneered the style in the 1960s and early 1970s. Similar experiments with recordings at the mixing desk were also done by producers Clive Chin and Herman Chin Loy. These producers, especially Ruddock and Perry, looked upon the mixing desk as an instrument, merrily manipulating tracks to come up with something new and different. These early 'dub' examples can be looked upon as the prelude to many dance and pop music genres.

Today, the word 'dub' is used widely to describe the re-formatting of music of various genres into typically instrumental, rhythm-centric adaptations.

Source : http://en.wikipedia.org/wiki/Dub_music