Mid-Atlantic Gardening: Yardening June 2015, 1 by coleup

coleup wrote:
Gita and all you other rock hounds,
you might enjoy reading about a 7 acre field of boulders in Bucks County PA , called Ringing Rocks Park. No on know how they got there or why they produce various tones when hit with a hammer or another rock. Some of the rocks have the notes of the sound they make marked on them..

"In June, 1890 Dr. J. J. Ott collected enough rocks with different pitches to play some tunes accompanied by the Pleasent Valley Band. This event took place at Stony Garden during the Buckwampun meeting and was, perhaps, the first ever rock concert."

http://www.davidhanauer.com/buckscounty/ringingrocks/