I bought a bar of chocolate. On the back was printed:

Our chocolate is infused with a 528hz love sound frequency to raise your vibe.

I was intrigued because I hadn’t heard of this love frequency thing. Calculations showed that 528hz would be a very sharp C5 on the piano – since with A4 tuned to 440 the C5 should be 523.251hz. I sent a message to Robby who in addition to being an amazing drummer also plays kora and guitar and piano and sings and… is an excellent piano tuner. I asked Robby whether he ever received a request to tune a piano to make C5 = 528hz. I imagined that Santa Fe or Sedona would be places where that could happen. Robby replied that nobody had ever asked him to tune a love-piano. He hadn’t heard about this frequency either BUT had inherited a tuning fork from another piano tuner that was 528 cycles. He never had occasion to use it and had wondered what that was about. Perhaps SOMEONE had requested a piano tuned to this frequency?

Ottmar: I wonder how they arrived at 528hz being the love frequency?
Robby: Because it is sharp.
Ottmar: Love has a sharp edge?
Robby: Cuts like a knife.
Ottmar: Mystery solved.