Which nine-time Grammy Award-winning pioneers of Christian music had their final performance in 1988?
Masters V: The Masters Five or Masters V was a Southern Gospel Music quartet founded in 1980 by Hovie Lister as a special consolidation of well-known performers from The Statesmen Quartet and The Blackwood Brothers. Masters V:  The group's final performance was in 1988. The Blackwood Brothers: The Blackwood Brothers are an American southern gospel quartet. The Blackwood Brothers:  They are nine-time Grammy Award-winning pioneers of the Christian music industry.
The Blackwood Brothers