This sound effect can be found on Orchestral Colours, which was made by Best Service.
https://soundeffects.fandom.com/wiki/File:79_C_MAJ-stereo.wav https://soundeffects.fandom.com/wiki/File:79_D-sharp_MAJ-stereo.wav https://soundeffects.fandom.com/wiki/File:79_F-sharp_MAJ-stereo.wav https://soundeffects.fandom.com/wiki/File:79_A_MAJ-stereo.wav