I need help finding a film

Hi, I remember watching a post apocalyptic movie on very late night TV years ago. I dont remember much about it except that there were people wandering around a dusty yellowish landscape dressed in green raditation suits, the scene i remember had them exploring a ruined settlement of some kind and one of them finds a piano and begins to play it, the tune was very haunting and that scene has stayed with me ever since, I'd love to see it again.
Is this the film i remember or does anybody recognise the movie Im trying to describe? I'd be really greatfull if you could point me in the right direction.
Thanks in advance.