Chaste Ascetic? A Letter Details Mahler's Love Life Left, Erich Auerbach/Getty Images Gustav Mahler and Natalie Bauer-Lechner. Though musicologists who specialize in Gustav Mahler have long taken the memoirs of his wife, Alma, with a grain of salt, most of them have accepted her portrait of him as a fairly chaste ascetic who had few romances before he met her. Now, two scholars say a recently discovered letter from a Mahler confidante - and sometime lover - Natalie Bauer-Lechner, instead shows that he had numerous affairs and infatuations. "The letter is a fairly complete account of love affairs with quite a number of people, starting with his involvement with a woman named Josephine Poisl, the daughter of the postman in Iglau, his hometown," said Stephen E. Hefling, one of the scholars, who hopes to publish the document. The 59-page letter, handwritten in German and called "Brief über Mahlers Lieben" ("Letter About Mahler's Loves"), was written to Hans Riehl, one of Bauer-Lechner's heirs, and should bring a new dimension to a composer whose titanic symphonies and bittersweet songs have become an increasingly central part of the classical repertory over the last 50 years, but who is often seen as an intensely brooding, introspective figure. Now he may be seen as less severe, and at times fairly randy. (Bauer-Lechner does not discuss whether Mahler had any affairs after his marriage. That was Alma's department: Mahler's despair on discovering her romance with the architect Walter Gropius caused him to seek advice from Sigmund Freud.) Bauer-Lechner, a violist, is hardly unknown in Mahler circles. The journal she kept during their long friendship - they met as students - was published in 1923, two years after her death (and 12 years after Mahler's, at 50) and is regarded as an important way around what some Mahler specialists call "the Alma Problem," meaning the nearly exclusive control of information about Mahler that his widow wielded for so many years. "Bauer-Lechner is one of the most important direct sources to Mahler, especially concerning the years before he married Alma," said Steve Bruns, the associate dean for graduate studies for the College of Music at the University of Colorado, Boulder, and an organizer of the annual Colorado MahlerFest. Her journals have been valuable to anyone who loves Mahler, not just specialists. I've only heard excerpts of the letter, but its wit and style really impressed me, as well as what a perceptive musical mind she had. That's probably why Mahler took her seriously. Henry-Louis de La Grange, whose mammoth, multivolume "Gustav Mahler" is regarded as the definitive work on the composer - and who was one of the first to see the new letter - said that Bauer-Lechner is "of huge importance" and a trustworthy source. "In her journals, she is so honest about so many things, and we would lack a great deal if we didn't have them," Mr. de La Grange said by telephone from Toblach, Italy. Mr. Hefling, a director of the Gustav Mahler New Critical Edition and a professor of music at Case Western Reserve University, in Cleveland, and Morten Solvik, a Norwegian Mahler specialist, are editing a new version of Bauer-Lechner's journal that will include passages that have never been published, as well as the new letter. They have submitted an article that includes and analyzes the letter's text to Musical Quarterly, a journal. Bauer-Lechner wrote the letter to Riehl (who, as far as Mahler scholars know, was a close friend, not a relative) in February 1917, apparently as a solution to what she regarded as a delicate problem: though she intended to publish her journals, she wrestled with the question of including Mahler's confidences about his relationships with women. She regarded it as important information that posterity would value, but also considered it improper to include such details. Bauer-Lechner said in the letter that by writing it, she was leaving the problem in Riehl's hands. But Riehl did nothing to make the letter public, and it remained unknown to Mahler scholars until 2011, and even then, they nearly missed it. "It surfaced at an auction at the Dorotheum," Mr. Hefling said in a telephone interview, referring to the Viennese auction house, "which is not a place that Mahler scholars or manuscript hunters look, because they deal mostly in jewelry and furniture. And it did not reach the minimum, which was not very high - something like 3,000 euros. If I'd known about it I would have found the money myself. Mr. Hefling and Mr. Solvik were pointed to the letter by an assistant at the International Gustav Mahler Society in Vienna, and learned that it had found its way to a shop there that specializes in antiquarian items. But when they contacted the shop, they learned that the music librarian of the Austrian National Archives had beaten them to it. The original is in the archives, but Mr. Hefling and Mr. Solvik obtained a copy and set about translating it, and provided excerpts. Among the paramours discussed in the letter are Marion von Weber, who was married at the time to the grandson of the composer Carl Maria von Weber, and several opera singers, most notably the sopranos Rita Michalek, Selma Kurz and Anna von Mildenburg - who, Bauer-Lechner wrote, told her that their romance was platonic.