Regarding trills in Classical Period piano works, where the tempo is 132 beats per minute and above, in the margins, I see the trills written as 8 thirty-second notes (semidemiquavers) for the right hand. However, at the tempo mentioned above, about 18 notes per second are required. Is this physically possible for a pianist? If not, what is the alternative rhythm for the hand that plays the trill? Doesn't anyone know of a documented top speed of notes per second in piano playing?