Incidentally, a post-apocalyptic world might sound bad, but this group in 'Survivors' (1975) have set up in a big country house after a plague has wiped out most humans and amazingly they seem to have adopted the right mindset pretty quickly and are having this after supper singsong to the light of paraffin lamps and acoustic guitar, it's almost as if they're glad they don't have to haul themselves out of bed tomorrow to go do boring jobs in the world.
Their choice of song is very telling because they know the old noisy rat-racing world has gone forever and doesn't matter any more..