Unfortunately for Lehrer he embarrassed himself in his final words by misremembering how long Mozart lived

The reports of my death are greatly exaggerated.

I sure hope they speak all of them before they die. Bit hard to understand a corpse.

In fact, I had the original album from the 1960s and, yes, that's where I heard the line.

(Lehrer was a mathematician) he did the maths! Well.. arithmetic.