Of course, if you know this music, you know that many classic "quartets" have five or more singers in them. Still-- it's known as the "quartet sound" internationally, so we're stuck with calling it that too! :~)

For a group focused even more on the singing, and more "classic" quartet harmonizing, see and hear the Blind Boys of Alabama HERE in an online concert from the Kennedy Center's Millenium Stage. Some songs a capella, othjers lightly accompanied by drums and electric guitars.

Times approximate; songs included:

00:50 God Said It, I Believe It
07:10 Walk in Jerusalem, Just Like John (I want to be ready)
11:22 My Lord, What a Morning (mourning)
15:40 Across the Bridge-- They announce it as a country-western song from Jim Reeves.
21:22 Somebody's Gone That Was Here Last Year-- a contemporary piece.
26:00 Lord, Please Remember Me (Do Lord)
29:40 I'm Getting Better All the Time
34:50 Remarks about the announcer's father, a pastor, alcohol, and other stuff.   
37:00 Remarks about the Blind Boys and a new CD.
38:50 You'll Never Walk Alone
43:03 Look Where You Brought Me From (can I get a witness) goes to 57:35 with a tour thru the crowd and a protracted bangup finish
57:40 Amazing Grace

There's another finale-piece, I think, but I can't make it out.

~Susan