Big Mama

One of the most remarkable Korean music groups I've encountered is Big Mama: four women, all (I think) in their thirties, and all utterly ravishing singers. I can't remember whether someone recommended them to me, or if I took a chance on a CD I found online. Start with an intricate and witty music video for "Break Away" (note the surprise at about 3:05):



Follow with a live performance of "Woman". The sound level is a bit low, but the power of their singing comes through:



Then the video of one of my favorites among their songs, "Sori":



I think it's a safe bet they started singing in church:



There's a fair amount of other material by them on YouTube, too. Look 'em up.