Does anyone know any good Barbershop quartets I can listen to online?

I’ve got to make a powerpoint for my music BTEC work on different ensembles and I’ve got to listen to a piece performed by a barbershop quartet and write about it so if you have suggestions they would really help. i also need to know how they rehearse (if they have formal rehearsals or just ‘get togethers’) so if you know that it would really help too, maybe one of you are in one? i don’t know but please help me.

Streaming,

http://www.live365.com/stations/spebsqsa

info,

http://www.barbershop.org/