MASH UP is "Song made from bits of other songs"
v. To take elements of two or more pre-existing pieces of music and combine them to make a new song.
n. A song comprised of elements of two or more pre-existing pieces of music.
2. I'm in the middle of mashing-up songs by Tom Jones and Michael Jackson. (verb usage)
1. I'll play my mash-up of Tom Jones and Michael Jackson at the club tomorrow night. (noun usage)