The year 2017 marks the 60th anniversary of the debut of the Great Stalacpipe Organ in Luray Caverns in Page County, Virginia. The Great Stalacpipe Organ, created over three years in the 1950s by Leland Sprinkle of Springfield, Virginia, uses rubber-tipped mallets to strike stalactites, which produce sounds with various tones and pitches.
A June 21, 2017, PBS NewsHour segment (2 min./49 sec.) on the organ is available online at http://www.pbs.org/newshour/bb/virginia-cavern-can-play-moonlight-sonata/.
More information on the creator of the organ is available in “Inside the Great Stalacpipe Organ: The World’s Largest Instrument,” by Blake Madden (April 15, 2015), online at http://www.trustmeimascientist.com/2015/04/15/inside-the-great-stalacpipe-organ-the-worlds-largest-instrument/.
For a Virginia Water Radio episode featuring the Great Stalacpipe Organ, please see “In the Cave” by Pepe Deluxé, for Virginia Cave Week (Episode 158, week of 4-22-13; 2 min./56 sec.).