Know Your Enemy" is the first single from Green Day's album 21st Century Breakdown, the eighth studio album by the American punk rock band. Featuring Green Day's classic, signature punk guitar-driven sound, this song is destined to become a "must know" for every Green Day fan! This 5 Finger Piano arrangement includes lyrics and is set in traditional five-finger style, with the melody split between the hands, and without a key signature in the student part. Dotted quarter notes, triplets and sixteenth notes have been avoided. An optional duet accompaniment is provided for a fuller, richer musical experience.