Yesterday I went to see The Avett Brothers live at Paradiso, Amsterdam. This American band makes a mixture of folk, bluegrass & country music. It's a great band with an amazing live performance. As soon as they are back in The Netherlands I will definitely go see them again.
One of the coolest things they did was this gospel song (Down in the Valley) completely a cappella:
This is another nice clip (Head full of doubt / Road full of promise):