The Brazilian-born pianist Arnaldo Cohen, now living in the United States, has long had a reputation for astonishing his audiences with the musical authority and blistering virtuosity of his performances. His graceful and unaffected platform manner belies playing of white-hot intensity, intellectual probity, and glittering bravura technique bordering on sheer wizardry. Long in demand internationally, Mr. Cohen has in the past few years entered a rarefied echelon among performers in America as well. He is regularly invited to appear as soloist with major orchestras, notably with the Philadelphia Orchestra under the distinguished conductor Wolfgang Sawallisch, and with such ensembles as the Cleveland Orchestra and the Los Angeles Philharmonic. His solo recitals everywhere draw enthusiastic crowds of cognoscenti. Critics, too, marvel at his mixture of musical complexity and élan. Professor at the Jacobs School of Music in Indiana.