Harnoncourt was a cellist with the Vienna Symphony from 1952 to 1969. In 1953, he founded the period-instrument ensemble Concentus Musicus Wien with his wife, Alice Hoffelner, whom he married during the year. The Concentus Musicus Wien was dedicated to performances on period instruments. He played the viola da gamba at this time, as well as the cello. For the Telefunken (later Teldec) label, Harnoncourt recorded Baroque repertoire, beginning with the viol music of Henry Purcell, and extending to include works like Bach's The Musical Offering, Monteverdi's L'incoronazione di Poppea, and Rameau's Castor et Pollux. One of his final recordings with the Concentus Musicus Wien was of Beethoven's Symphonies Nos. 4 and 5.
