Dear 100 Hour Board,
I need to update my music. I like the Decemberists, Mumford & Sons, Adele, Arcade Fire, and Iron and Wine. Any suggestions for other groups I might like?
I would suggest Lord Huron, The National Parks, City and Colour, Blind Pilot, The Head and the Heart, and Hozier. I linked to one of my favorite songs by each band for you, but you can obviously look around and see what you like outside of those songs. Good luck updating your music!
I'd like to second all of Alta's suggestions. Some artists that she didn't mention that I would are Young the Giant, The Shins, The Lumineers, and Fleet Foxes.