I sing barbershop music.  Do you like barbershop music? 
Yes i do. It's like a style of a cappela close harmony that's popular today.
A capplea is done without instruments correct? 
Yes, it's unaccompanied vocal music.
What are your favorite artists? 
I like the female quartets the most. They are sometimes referred to as "Sweet Adelines quartets".
Any group names that you know of? 
No I don't. I just know usually it's a quartet of 4 people. Sometimes there are less than four.