this has already been posted, but
Dub music is an offshoot of reggae music, characterized by instrumental remixes of previously-recorded, typically reggae, music and audio samples that are further manipulated with sound effects such as loops, echoes, and reverbs. This remixing generally changes the original material so much that new songs, or “versions,” are created. Dub music was the was the first music genre to use samples and the engineer’s sound board alongside, or in place of, live or recorded singers and musical instruments.