To-morrow is our first entertainment in the Augarten. At half-past eight Martin is to call for me in a hackney-coach, and we have six visits to make; I must be ready by eleven o'clock to go to Rumbeck; then I dine with the Countess Thun; we are to rehearse the music in her garden in the evening. There is to be a symphony by Van Swieten, and another by me; Mdlle. Berger, an amateur, is to sing; a boy named Türk[46] is to play a violin concerto, and Fräulein von Aurnhammer and I the duet concerto in E flat (365 K.). The first concert went off well; among the audience were the Archduke Maximilian, the Countess Thun, Wallenstein, Baron van Swieten, and many other musical connoisseurs, but we hear nothing further of the undertaking, which cannot have been so brilliant a success as had been hoped.[47] There was no doubt, however, as to the success which Mozart achieved during the Lenten concerts of 1783. He contributed greatly towards the success of a concert given by his sister-in-law, Aloysia Lange, at the theatre on {CONCERT FOR ALOYSIA LANGE.} (285) March 11. His Parisian symphony for the Concert spirituel (297 K., Vol. II., p. 49) was performed on this occasion, after which Madame Lange sang the song which he had composed for her in Mannheim: "Non sò d'onde viene" (294 K., Vol. I., p. 419), with new variations for the voice. How many memories it must have awakened in them both! "Gluck had the box next to the Langes," he informed his father (March 12, 1783), "in which was also my wife. He could not praise enough either the symphony or the song, and he invited us all to dinner next Sunday." In addition Mozart played a concerto of his own composition. "The theatre was very full; and I was so well received by the public, that I could but feel happy and content. After I had gone away the clapping was so persistent that I was obliged to return and repeat the rondo. It was a perfect storm of applause." For his own concert on March 22 every box was taken, and the theatre "could not have been fuller." The programme of this concert, which he copied for his father, gives us an idea of what Mozart's concerts were. There were performed:-- 1. The new Hafner symphony, composed the previous summer (385 K., Vol. II., p. 210). 2. Air from "Idomeneo," "Se il padre perdei" (366 K.), sung by Madame Lange. 3. The third subscription concerto, then just published, in C major (415 K., No. 5). 4. The Countess Baumgarten's scena (369 K., Vol. II., p. 168), sung by Adamberger. 5. The short Sinfonia-concertante of the last "Final-musik" (320 K., Vol. II., p. 87). 6. The favourite concerto in D (175, 382 K., Vol. I., p. 324). 7. Scena, "Parto, m' affretto," from "Lucio Silla" (135 K., Vol. I., p. 180), sung by Mdlle. Teyber.