Did Antonin Dvorak ever perform with the New York Philharmonic? (Yes.)
How many times has violinist Joshua Bell performed with them? (28 performances of 11 different programs.)
How did the orchestra respond to the assassination of President Lincoln? (They played the “Funeral March” from Beethoven’s 3rd Symphony, and left the “Ode to Joy” off of his 9th.)
How do I know all of this? Because they put it all online. The curious can explore a searchable database of every NY Phil concert since 1842. Read more about it here (registration required). Play with it here.