(b Lisbon, 6 Jan 1871; d Buenos Aires, 18 Sept 1965). Portuguese soprano. She came from a family of musicians, her father, José Pacini (who was also her first teacher), being a well-known baritone and director of the S Carlos at Lisbon, where Regina made her début in 1888 as the heroine of La sonnambula. The following year she appeared in Milan and Palermo and in James Mapleson's last season at Her Majesty's in London. She quickly became a favourite in Spain, singing also in the 1890s in Russia, Poland and South America. In 1902 she reappeared in London, singing at Covent Garden with Caruso in L᾽elisir d᾽amore and Lucia, and was praised by the Musical Times for ‘vocal agility such as this generation seldom hears’. She was again Caruso's partner at Monte Carlo in 1904, and in 1905 sang there in I puritani and Il barbiere with Bonci. At the height of her career in 1907 she retired and married Marcelo de Alvear (later president of Argentina), which enabled her to exercise an influence on the musical life of the country. Her recordings are rarely without some flaw of voice or style but she is impressively fluent; the upper part of her voice was particularly lovely.
From The Grove Book of Opera Singers in Oxford Reference.