Like metalcore, deathcore is known for its use of aggressive screaming, though at a much more extreme rate. Screams range from the low death growls of vocalists such as Phil Bozeman of Whitechapel, to the high pitched screams from the likes of Alex Koehler of Chelsea Grin. Some bands relating to the deathcore genre perform what is called "pig squealing", which is a squealing vocal technique resembling that of a pig. Early albums by deathcore bands such as Job for a Cowboy and Despised Icon employed the use of pig squeal vocals, but abandoned it on later material.