Autograph letter in the third person, as Mr. Kelly, requesting the use of Dr. Burney's Box at an Opera Salon in Pall Mall to be held on May 20th, 1806. In a response dated on the 20th May 1806, Burney explains that he was on the road and unable to send the letter until 4 o'clock that day, and therefore sends apologies to Kelly.

Consists of an address panel, likely a fragment of a letter. The four corners are clipped. Addressed to Keane Fitzgerald Esq., Mitre Court Buildings, Inner Temple. The fragment contains a later biographical note: "from Dr. Burney who wrote 'History of Music.' Father of Madame D'Arblay author of Cecilia.'