Here are the three most popular songs from the 2009 album by Green Day: 21st Century Breakdown; Know Your Enemy; and 21 Guns. Presented in an easily mastered arrangement that includes enough repeated material to keep rehearsal time to a minimum, this is definitely one that your students will enjoy playing again and again. Special attention has also been given to chord voicings to produce a full, mature sound, with melodies scored in the upper and lower string parts.