The Oh Hellos are an absolutely amazing brother/sister folk band hailing from Texas.  Their sound is somewhere around Mumford & Sons with a splash of The Head and The Heart.  How The Oh Hellos have not completely blown up yet is simply a matter of timing.  Released just last month, their debut full length album, Through the Deep, Dark Valley, is a concept album with a warm sound and beautiful lyrics.  Best of all, the entire album is available over at Bandcamp on a name-your-price basis.  Get it while it lasts!