Reddit reviews Fly for Your Life

The book gives this as a reference:
> p. 86 SS pianist, Stanford-Tuck, Larry
Forrester, Fly for Your Life, London,
1956

https://www.amazon.com/Fly-Your-Life-Larry-Forrester/dp/0553203916/

I have that book as well:
> After a two-day battle against an S.S. unit, one survivor was captured—a boy of about eighteen who, the Russians somehow discovered, was a fine pianist. They dragged this lad into a farm house taken over as the officers' mess, dumped him in front of an ancient piano and told him: "As long as you keep playing, you live. As soon as you stop we will kill you!"

> The youth was already exhausted by days of hard
fighting, but he played for sixteen hours without respite. Chopin, Liszt, Grieg, and an assortment of light music and popular songs. He really was an excellent pianist. His captors flocked round the piano, humming and singing. They clapped him on the back, fed him drinks until he was half-tipsy. And when finally he slumped forward over the keyboard, sobbing and moaning, they picked him up, carried him outside, propped him against the back of the house and blasted him with Tommy guns.

-- pg. 358

Robert Stanford Tuck's biography Fly For Your Life is hands down one of the best books I've ever read. His account of the Battle of Britain is exceptionally interesting. Definitely worth a read if you can find a copy.