In 1932, in Paris, she established Editions de l'Oiseau-Lyre (Lyrebird Press), and as a music publisher set about reviving baroque and medieval music, in rare editions notable both for their scholarship and sumptuousness. Later (assisted by a second husband, 25 years younger) she began to make discs to illustrate these editions. From that original idea the recording venture grew and grew: in 1950 Louise made the first long-playing records in Europe, and by the time she died Oiseau-Lyre was a famous label, putting out some of the earliest recordings by such people as Dame Joan Sutherland, Sir Colin Davis, Sir Neville Marriner and the Academy of St. Martin in the Fields, and Dame Janet Baker.