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Vladimir Horowitz
'Harpejji' gaining traction in music world
'Harpejji' gaining traction in music world

It looks a little bit like a body board, and it does ride the waves — sound waves, that is. Meet the harpejji, a fretted string instrument invented and built in the Baltimore area. Coldplay bought one. A.R. Rahman, who composed the score to "Slumdog Millionaire," purchased several of the instruments. A huge global audience saw Rahman play one during the Academy Awards ceremony last February, in a performance of the song "If I Rise" from his score to "127 Hours." And Jordan Rudess, keyboardist of prog-metal group Dream Theater, plans to feature the harpejji (pronounced "har-PEH-jee") in concerts this fall. "The first harpejji was sold in...