Barbershop Quartets (YouTube Links)

• "You've Got A Friend", "You Can Fly" (Guys)
• http://www.youtube.com/watch?v=I_hsWuirT2M

• Music Man(Guys)
• http://www.youtube.com/watch?v=TbBITrZa6Ok

• And So It Goes (Girls) (Meh)
• http://www.youtube.com/watch?v=UZc7tvCWXFE&feature=related

• Mary Did You Know (Girls)
• http://www.youtube.com/watch?v=NVxsO5giBjU&feature=related 

Okay I'm tired. More later.
Just go to YouTube if you're interested and just keep clicking till you find one you like.
You're bound to like at least one quartet (: