At the funeral of the tenor Adolphe Nourrit in Paris in 1839, Chopin made a rare appearance at the organ, playing a transcription of Franz Schubert's lied Die Gestirne. On 26 July 1840 Chopin and Sand were present at the dress rehearsal of <answer>Berlioz's Grande symphonie funèbre et triomphale</answer>, composed to commemorate the tenth anniversary of the July Revolution. Chopin was reportedly unimpressed with the composition.
What was the dress rehearsal for?
Berlioz's Grande symphonie funèbre et triomphale