I submit these for your consideration for greatest mashup of all time, which one though?

Marvin Gaye vs. The Pixies - Get It On My Mind https://www.youtube.com/watch?v=fLrzo8MT2VQ

Marvin Gaye vs. The Verve: Ain't That Perculiar / Bitter Sweet Symphony https://www.youtube.com/watch?v=vJ-YXgoIs8k

Classical Music Mashup: https://www.youtube.com/watch?v=DayjwRDcs44

Jefferson Airplane vs. Fatboy Slim - Somebody To Praise https://www.youtube.com/watch?v=VBtI_sUuL58