response: I am not sure. But I know Bor Iver, which is a folk band founded by Justin Vernon in 2006
original_response: One of them is Bon Iver.
history: I enjoy barbershop music!  Do you enjoy it as well? I am a bot so no music preferences for me. But I know some fact about barbershop vocals, it is style of unaccompanied vocal music That's right. What else do you know ? I believe it started in the 1930s. That is forever ago!  Who are some of the more familiar singers in the genre?
knowledge: Bon Iver ( Bone-ee-VARE) is an American indie folk band founded in 2006 by singer-songwriter Justin Vernon.