Green Day-21 Guns- Bad Ukulele Cover Mrz 15, 2017 1,039/Smoothed Out Slappy Hours, 21st century Breakdown, Cover 21 guns, Cover Green, Cover GREEN DAY, Cover Punk Rock, Cover Rock, Ew. Like 0 Thanks! You've already liked this « Boulevard Of Broken Dreams (Green Day Cover) » Good riddance Green day cover (my version of it. )