"To take Germany prior to 1600 as an example, organ pitch there is thought to have varied from a high of A=567 Hz for the first simple pipe organs of the Middle Ages to a low of A=377 Hz for the early ...

Bluetooth speakers are a dime a dozen, but when you come across one like the Bang & Olufsen Beosound A1, it's easy to forget all of the speakers that came before it.