Watch What Guster Did When They Found a Video of Two Fans Covering Their Song

Guster's Brian Rosenworcel was on the band's Twitter one night and noticed a video of a couple of fans covering their tune "Diane." As you can imagine, the happens to bands all of the time. So often that there's no way you could watch every one of them. Brian not only shared it with the other guys in the band but they decided to take it to the next level. The fan's reaction is priceless...