noun

• (music) A rearrangement of an older piece of music, possibly including various cosmetic changes.
• (music) A piece of music formed by combining existing pieces of music together, possibly including various other cosmetic changes

verb

• (transitive) To mix again.
  "Overhauling serves to remix the brine and to shift the meat so that all pieces will be exposed to the brine."
• (music, intransitive) To create a remix.
• (music, transitive) To rearrange or radically alter (a particular piece of music).
• (transitive) To modify (a work in any medium).
  "It is essential that we maintain focus on originality as an ethical issue. A broader idea of creativity does not mean that 'anything goes' and sometimes attempts to reuse or remix the work of others becomes an ethical, even a legal, problem […]"