Killswitch Engage is an American metalcore band formed in 1999 in Westfield, Massachusetts. The group is known for its blend of heavy metal and melodic elements, characterized by powerful guitar riffs, aggressive vocals, and emotional lyrics. They gained popularity with their self-titled album and the hit single "My Last Serenade." The band has undergone several lineup changes, with Jesse Leach and Howard Jones both serving as lead vocalists at different times. Killswitch Engage has released multiple successful albums, earning a dedicated fan base and critical acclaim within the heavy music scene. Their influence can be seen in many contemporary metal and hardcore bands.