Simplify the following text for a Grade 9 native English-speaking person.
Original: Slayer rose to fame with their 1986 release , Reign in Blood , and is credited as one of the `` Big Four '' thrash metal acts , along with Metallica , Megadeth and Anthrax .
Simplified: Along with Metallica , Anthrax and Megadeth , Slayer is known as one of the `` Big Four '' of thrash metal music .