Not sure if it has already been posted or not, but here is Mr. Ennis at the Willie Clancy summer school in 1978. 
https://www.rte.ie/archives/2018/0704/976264-uileann-piper-seamus-ennis/
What do you get when a piano falls down a mine shaft ?
RORY
A flat minor. Yes, it was up earlier, but who’d ever get tired of watching it? 
I was there at the time with my new ckanter, bag and bellow. My tutor was Brendan Breathnach who was using the whistle to learn us the chanter.