Steampunk functions on the premise that society remained on steam power rather than shifting to combustion engine designs as happened in our timeline. People often assume a fantastical element in some of the more mundane steam designs because they’ve never seen a steam-powered car (they’re slow but did exist), a steam-powered wheelchair (similarly), or any of the many machines that functioned before the switch.
While not every design appearing in novels and other steampunk works is plausible, I bring you a very real musical instrument driven by steam power. The calliope might be a bit jarring at first, but then the tune becomes recognizable, so be patient. What are some of the steam-powered machines you’ve run across? Most people know about early trains, but there were many more.