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This photo dates from Rocky Ridge in 1969.
The pianist on the right is David Abbott. I (David Wasserman) am the one on the left. David and I accompanied each other on Mendelssohn;s Piano Concerto #1. He accompanied me on the first movement; then we switched, and I accompanied him on the second and third. I believe Ed Grace is second from the right.
Details thanks to David Wasserman, RRMC 1967-69.