Bluegrass Student Union is the Louisville, Kentucky barbershop quartet who won the 1978 SPEBSQSA International competition. They distinguished themselves by performing at a high level of proficiency on stage and in the recording studio throughout their 33-year career, and were the second youngest quartet to have won the SPEBSQSA championship, as of that time. The quartet became known for continually improving their art, even after their win. They credited much of their success to their coaches, Mary Jo Hatton Thompson, Don Clause, Ron Riegler, Gene Stickler and Ed Weber, to their chorus Director, Jim Miller, and to their long-time arrangers, Ed Waesche and Walter Latzko.
Bluegrass Student Union's members were Allen Hatton, Ken Hatton, Dan Burgess, and Rick Staab.
Allen Hatton later sang tenor with the original version of the Second Edition quartet to win the Cardinal District Quartet Championship for his second time, in 1986.
Ken Hatton later sang lead with the 2000 Cardinal District Champion SENSATIONS quartet, who earned semi-finalist status in the 2001 International Quartet Competition.
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