...that probably all non-trivial zeros lie on one, critical line.
The title alludes to one of the biggest and mysterious unsolved problems in modern math: The Riemann Hypothesis. It drove generations of mathematicians to desperation (and in one case, to insanity). The power of it being a specific function (The Riemann-Zeta function) which can derived from prime numbers. The confirmation of the hypothesis will trigger a new understanding of prime numbers which will also enable a extreme and dangerous amount of power since many secure codes are generated from prime numbers.
"...that probably all non-trivial zeros lie on one, critical line." explores the psychological impact of the hypothesis by means of extreme tempi: Over the course of 40 minutes, the pianist almost constantly changes the tempo (sometimes repeating a single note for pages) which accelerates to limits of playability and slows down to almost unbearably slow pace.