Disclosure: I received complimentary products to facilitate this post. All opinions are my own.
Peter Hollens is an amazing a capella artist - and that's not an easy thing to do. It's quite difficult to sing without any instrumental accompaniment and still stay true to pitch and musically interesting. He's very versatile, too, covering Broadway, film, game music, folk, pop, and more. He recently released his debut album. It's easy to listen to and perfect for relaxing at the end of the day. He also collaborates with some other well-known vocalists, including Avi Kaplan and Brian Wilson. The album contains something to please everyone, with the main theme from Skyrim, Hallelujah, and Black is the Color of My True Love's Hair.