I know there are probably music fans who do not like Mumford & Sons (my wife among them), but this group is clearly one of the most popular folk rock bands ever. I was introduced to them by my then 17-year-old high school junior and fell in love with their sound. The idea that folk influenced rock music was making a serious comeback is very interesting on the heels of a dark thematic period in rock. This music is much more optimistic. Right?