At this point, Hadfield is definitely living the filker power fantasy.
Here’s a video put together by him and his brother, which apparently tickled the heck out of David Bowie.
Note the actually-pretty-daring stunt with the guitar. Wouldn’t have been pretty to kill your guitar when you’re up in space. It’s probably not the first time anybody in space has sung the song (a lot of astronauts and cosmonauts sing and play), but it’s definitely the most stylish!