Zao is an American metalcore band founded in Parkersburg, West Virginia, and later relocated to Greensburg, Pennsylvania. Founded in March 1993, Zao has hosted several musicians and endured numerous roster changes to the point where no original members remain. Former drummer Jesse Smith, vocalist Dan Weyandt, and guitarists Scott Mellinger and Russ Cogdell are seen by some fans as the "core" of Zao, with the current line up being the longest running in the band's history.

Metalcore is a fusion genre combining elements of extreme metal and hardcore punk, that originated in the late 1980s. Metalcore is noted for its use of breakdowns, which are slow, intense passages conducive to moshing, while other defining instrumentation includes heavy guitar riffs often utilizing percussive pedal tones and double bass drumming. Vocalists in the genre typically perform screaming, more popular bands often combine this with the use of standard singing, usually during the bridge or chorus of a song. However, the death growl is also a popular technique within the genre.