Thanks to Jack from Jacksfilms on piano:    / jacksfilms   • And thanks to everyone who answered! Sources and a data download are in the description.

History sources:
https://www.cracked.com/blog/thesecr...
https://www.cbr.com/jinglebellsbatm...

Data spreadsheet link:
https://docs.google.com/spreadsheets/...

Audio mix by Graham Haerther: https://haerther.net

MORE FROM TOM: https://www.tomscott.com/
(you can find contact details and social links there too)

WEEKLY NEWSLETTER with good stuff from the rest of the internet: https://www.tomscott.com/newsletter/
❓ LATERAL, free weekly podcast: https://lateralcast.com/    / lateralcast  
➕ TOM SCOTT PLUS:    / tomscottplus  
THE TECHNICAL DIFFICULTIES:    / techdif