Deathcore is an amalgamation of two musical styles: metalcore and death metal. While similar to slam death metal and deathgrind, deathcore usually contains song structure and aesthetics more closely related to metalcore, and takes from death metal its speed, heaviness, and approach to riffing. The lyrics may not always be in the death metal vein, but traditional growls, pig-like vocals (pig squeals), and shrieks predominate, with metalcore vocals rarely being used.