Megadeth frontman Dave Mustaine believes Testament, Trivium, Overkill and Exodus are thrash metal's new "Big Four" bands.
The 65-year-old rocker's group was one quarter of the so-called "Big Four" of thrash metal in the 1980s, alongside Metallica, Slayer and Anthrax - but he has put together a "new young generation" to spearhead the genre.