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My intention in carrying with me this rnanufcript 
compofition, was to have an irrefragable proof of 
his abilites, as a player at fight, it being abfolutely 
impofiible that he could have ever feen the mufic 
before. 
The fcore was no fooner put upon his defk, than 
he began to play the fymphony in a moft maderlv 
manner, as well as in the time and fiile which cor- 
refponded with the intention of the compofer. 
I mention this circumftance, becaufe the greated 
maders often fail in thefe particulars on the firft 
trial. 
The fymphony ended, he took the upper part, 
leaving the under one to his father. 
His voice in the tone of it was thin and infantine, 
but nothing could exceed the maderly manner in 
which be fung. 
His father,, who took the under part in this duet, 
was once or twice out, though the paflages were not 
more difficult than thofe in the upper one ; on which 
occcalions thefon looked back with fome anger, point- 
ing out to him his mifiakes, and fetting him right. 
He not only however did complete judice to the 
duet, by finging his own part in the trued tafte, and 
with the greated preciiion : he alfo threw in the 
accompaniments of the two violins, wherever they 
were mod neceflary, and produced the bell effects. 
It is well known that none but the mod capital 
muficians are capable of accompanying in this lupe- 
rior dile. 
As many of thofe who may be prefent, when this 
letter may have the honour of being read before 
the fociety, may not podibly be acquainted with 
Vol. LX. I the 
