Question: Which nine-time Grammy Award-winning pioneers of Christian music had their final performance in 1988?
Context: Aaron A. Brooks, also known as, Aaron Kinsley-Brooks (born January 24, 1964, San Francisco, California) is an American rock musician, drummer, producer and composer.  He co-founded The Little Death with Moby, Laura Dawn and Daron Murphy.  He is a founding member of the American alternative rock band, The Mars Bonfire.  Aaron also plays or has played drums for the electronic pop band Leisure Cruise; Grammy nominated electro-pop chanteuse Angela McCluskey (of Télépopmusik and Wild Colonials); Grammy award-winning producer/songwriter Mark Hudson; Emmy award-winning actress and singer Jackie Cruz; Grammy award-winning artist Moby; Singer/songwriter and progressive political activist Laura Dawn; Grammy award-winning bassist/songwriter and rock musician Duff McKagen of Guns N' Roses; Circle of Soul; Erin Evermore; Grammy award-winning pianist and songwriter A.J. Croce; Grammy winning singer/songwriter Lana Del Ray; Writer, radio host, progressive political comic and guitarist/singer Jamie Kilstein and his band The Agenda; Model/actress/singer/songwriter Heidi Merrill; And NY based rock singer Carleigh Jade. A list of Christian music festivals around the world.  A Christian music festival is a festival oriented towards genres of Christian music, such as gospel music, church music, liturgical music, or contemporary Christian music such as Christian pop and Christian rock.  Festivals are held worldwide, and in North America many are overseen by organizations such as the Christian Festival Association. A Christian music festival (also known as a Jesus music festival or simply a Jesus festival) is a music festival held by the Christian community, in support of performers of Christian music.  The festivals are characterized by more than just music; many feature motivational speakers and evangelists, and include seminars on Christian spiritual and missions topics, service, and evangelism.  They are often viewed as evangelical tools, and small festivals can draw 10 times the crowd of traditional revival meetings.  While the central theme of a Christian festival is Jesus Christ, the core appeal of a Christian music festival remains the artists and their music.  Critics point out that the dichotomy of business and religious interests can be problematic for Christian festivals.  In similar ways as the Christian music industry in general, festivals can be drawn away from their central theme and gravitate toward commercialization and mainstream acts in an attempt to draw crowds. The Gotee Brothers were a Contemporary Christian Music group formed of Toby McKeehan (tobyMac), Joey Elwood, and Todd Collins that recorded one album in the 1990s entitled "ERACE".  The album's name abbreviated "Eliminating Racism and Creating Equality", and its contents dealt with racial issues.  McKeehan is currently a Grammy Award-winning solo artist who was also part of the Grammy Award-winning group dcTalk from 1988-2001.  Both McKeehan and Elwood are co-founders of Gotee Records, best known for bringing acts to the scene such as GRITS, Family Force 5, Relient K, and Stephanie Smith. GLAD is one of the pioneers of Christian pop/rock and a cappella music, having formed as a progressive rock group in 1972 and discovered a large audience for their a cappella music in 1988.  Today, with over 1.5 million albums sold, they continue to perform concerts and release occasional recordings.  As Contemporary Christian Music ("CCM Magazine") described it, "GLAD's elegant vocals helped set them apart from other pioneers of Contemporary Christian music.  That vocal sound has since evolved into a complex, self-sustaining life form of its own..." 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.  The group featured J.D. Sumner as bass, Rosie Rozell as tenor, James Blackwood and Jake Hess alternating between lead and baritone, and Lister on piano.  Their self-titled debut album, "The Masters V", won the 1981 Grammy Award for best traditional gospel performance.  The quartet subsequently endured several personnel changes, often due to health and age-related issues.  The group's final performance was in 1988. Latin Christian music (Spanish "Musica Cristiana Latina") is a subgenre of Latin music and Contemporary Christian music.  Christian music is well established in Latin America's Evangelical churches, but is also popular with the majority Roman Catholic community.  Both the Latin Grammy Awards and Latin Billboard Music Awards have Christian music categories, (e.g. Latin Grammy Award for Best Christian Album (Spanish Language)), though the markets are often underestimated due to lack of reporting. Lauren Ashley Daigle (born September 9, 1991) is an American contemporary Christian music singer-songwriter from Lafayette, Louisiana.  Daigle is signed to the Centricity Music label.  Her first full-length album, "How Can It Be," was released in April 2015 and went on to achieve Gold Record status.  Daigle was awarded the New Artist of the Year title at the 2015 GMA Dove Awards, with her single "How Can It Be" winning the Song of the Year.  The next year, she went on to win Dove Awards for Artist of the Year, Songwriter of the Year, and Best Contemporary Recorded Song of the Year, with her single "Trust in You."  Daigle's album "How Can It Be" was nominated for a 2016 Grammy Award for Best Contemporary Christian Music Album; her single "Trust in You" was nominated for a 2017 Grammy Award for Best Contemporary Christian Music Performance/Song. The Grammy Award for Best Gospel Performance/Song is a new category at the 2015 ceremony of the annual Grammy Awards.  It combines two previously separate categories in the Gospel/Contemporary Christian Music field, Best Gospel Song (for songwriters) and Best Gospel/Contemporary Christian Music Performance (for performers).  The new category will recognize both songwriters and performers (solo/duos/groups/collaborations/etc.)  and is open for singles or tracks only.  Songwriters are only awarded a Grammy Award if it is a newly-written song.  Grammy's for cover versions of previously recorded songs are awarded to the performer(s) only. The Blackwood Brothers are an American southern gospel quartet.  They are nine-time Grammy Award-winning pioneers of the Christian music industry.
Answer: The Blackwood Brothers