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Use "euphoniumist" in a sentence
"We batted back and forth what you call a musician who plays a euphonium--euphoniumist, euphoniumer, or my personal favorite--euphonist."
"SYMBIOSISDUO - Dr. Stacy Baker, tubist and professor of music at Morehead State University, and Gail Robertson, euphoniumist and instructor of music at the University of Central Florida"
"Guest conductor Dr. Steven Schopp (NYSSMA Executive Director as well as HCB principal euphoniumist)."