MASHUPS

A mashup or blend (also mesh ,mash up and mash-up) is a song or composition created by blending two or more pre-recorded songs, usually by overlaying the vocal track of one song seamlessly over the instrumental track of another.
Mashups are known by a number of different names such as Bootlegs, Boots, Mashed hits, Smashups (or Smash-Ups), Cutups, Powermixing, Crossovers and Edits.