Files can be accessed directly like so:
https://ledlamp.github.io/piano-sounds/GreatAndSoftPiano/a0.mp3
Tip: Fork this repository if you want to hotlink these sounds, in case this repository changes.
Most of these sounds came from electrashave at http://files.meowbin.com/Sounds. GreatAndSoftPiano, HardAndToughPiano, and LoudAndProudPiano were obtained from Yoshify by FireController1847.