Among the Lisztian relics found by Helbig’s heirs (see Quaderni dell’Istituto Liszt, n.1, 1998, pp. 7-8) the most precious is the autograph of Weihnachtslied “O heilige Nacht” for tenor, female chorus and organ and one part of the chorus used during the first performance (December 25, 1881), with corrections in the author’s hand. What Nadine Helbig tells about the origin of the composition and the reading of the manuscript (that was considered lost) permits us to correct the date given for this piece in the major catalogues. Moreover we can now state that this motet is not a transcription of the second piece of Weihnachtsbaum, as believed previously, but that the piano piece derives from the vocal score. Since both works – Weihnachtsbaum and Weinachtslied – were published 1882, the latter was possibly composed at the end of 1881 or at the beginning of 1882. The Liszt autograph, given in facsimile, reveals the inner creative process, especially at the coda, which Liszt rewrote four times.