Big thanks to Alan Jacobs (https://ayjay.org/) for introducing me to this video through his excellent newsletter - Snakes & Ladders.
"If you haven’t heard Marc Martel — who dubbed some of Rami Malek’s vocals in Bohemian Rhapsody — sing, um, “Bohemian Rhapsody” by himself, accompanying himself on piano, in one take, well: here you go." -- Jacobs