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Top Vocal Groups Turn Heads With New Sounds

3 Day A cappella Music Festival Raises Eyebrows and Money For Charity RESTON, VA – March 27, 28, 29, 2009 – Over 100 of the best professional a cappella singers from Germany, Denmark and the United States will take the stage at South Lakes High School for the annual 3 day a cappella music festival, “SingStrong” from March 27 to 29, 2009.