Draft in the hand of Charles Burney of his unpublished work, The Trial of Midas the 2nd, or Congress of Musicians, a satire on John Hawkins' A general history of the science and practice of music (1776). Including corrections, additions and footnotes also in Burney's hand.
See W. Wright Roberts (ed.) The trial of Midas the second, Bulletin of the John Rylands Library, vol. 17 (1933), pp. 322-32.