Each week, Billboard.com hosts Mashup Mondays, a series that gives some of music's biggest acts a chance to cross genres by performing a stripped down cover of a famous tune that is beyond their usual sound.

This week, rapper Iyaz covered Green Day's song 21 Guns. You can watch his performance over on Billboard.com.

"There's something about Green Day: those guys go hard," says R&B newcomer Iyaz, who chose the punk trio's 2009 single "21 Guns" to mashup with his sweetened tenor. You wouldn't guess it, but the singer, who scored his first Pop Songs No. 1 in January with "Replay," is a big Green Day fan. "I've been listening to them for years... so I said why not do a cover [and] show my appreciation for their music.""


So how do you think that he did? Post your thoughts in the comments.
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