Task: Explanation
Input (English): The first National Quartet Convention was held in 1957. J. D. Sumner, Cecil Blackwood and James Blackwood of The Blackwood Brothers were the founders of the famous National Quartet Convention formerly held in Memphis, Tennessee. The National Quartet Convention featured all the major gospel groups at a three-day event at the Ellis Auditorium in Memphis, Tennessee. After the first couple of years, the NQC was moved to Birmingham, Alabama in 1959 and Atlanta, Georgia in 1960. It returned to Memphis in 1961 and was drawing annual crowds of 20,000 by the mid-1960s. Sumner bought the convention in 1971 and moved it to Nashville, Tennessee in 1972, where it remained until 1993. The National Quartet Convention was held in Nashville, Tn. through 1993. After 1993, it was moved to a new home, Louisville, Kentucky. In 2014 the convention moved to Pigeon Forge, Tennessee. Question: Which nine-time Grammy Award-winning gospel group helped found the National Quartet Convention? Answer: The Blackwood Brothers
Output (English):  J. D. Sumner, Cecil Blackwood and James Blackwood of The Blackwood Brothers were the founders of the famous National Quartet Convention formerly held in Memphis, Tennessee.