elevator.js
Finally, a "back to top" button that behaves like a real elevator, by adding elevator music to quietly soothe the awkwardness that can ensue when being smoothly scrolled to the top of the screen.
License
Elevator.js is covered by the MIT License. Audio in the Demo (sourced from BenSound) is licenced under Creative Commons. Copyright (C) 2015 ~ Tim Holman ~ timothy.w.holman@gmail.com
Repo: https://github.com/tholman/elevator.js
The plugin itself is covered by the license Kostenlose Plugins.