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Salamander Grand Piano V3 by Alexander Holm.
Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0).
https://creativecommons.org/licenses/by/3.0/

Original sample library: https://archive.org/details/SalamanderGrandPianoV3
Library and licence: https://github.com/sfzinstruments/SalamanderGrandPiano
MP3 distribution: https://github.com/Tonejs/audio/tree/master/salamander

Ds4.mp3, Fs4.mp3 and A4.mp3 are unmodified MP3 files from that distribution.
Website playback adjusts pitch by at most one semitone to produce D4, E4,
F4, G4 and A4, and applies quiet gain and a short fade-out. The piano samples
retain their CC BY 3.0 licence, separate from Anastasia's original music.
No endorsement is implied.