Cache is not at the posted coordinates (seeing as how they're in the middle of the lake and all). Cache is here:
N 43 3H.DFG
W079 2L.TBA
You may want to print this. Higher quality images may be viewed here: https://www.dropbox.com/sh/vje92xi9wcrmqa5/VkhUpliXaV
H=What date was this piece first performed? Add the second digit in the day to the digit that corresponds to the month.
D=This piece was written to commemorate the death of how many people?
F=How many movements are in this piece? That number plus 2.
G=How many letters are in the last name of this composer?
L=What does the word in this excerpt mean? Take the first letter of the more common word with the same meaning. This letter's placement in the alphabet is the digit you need.
T=What does this word mean? How many times can this happen to a person?
B=How many letters are in the longest word from this excerpt? Minus 7.
A=What is the name of the movement that this duet comes from? Count the letters in the title. Minus 1.
Please do not swim to this cache - large boats/ferries pass through this area. Cache is somewhere on Toronto Islands.
You can check your answers for this puzzle on GeoChecker.com.