This sound effect can be found on Orchestral Colours, which was made by Best Service.
https://soundeffects.fandom.com/wiki/File:47_C_0_-stereo.wav https://soundeffects.fandom.com/wiki/File:47_D-sharp_0_-stereo.wav https://soundeffects.fandom.com/wiki/File:47_F-sharp_0_-stereo.wav https://soundeffects.fandom.com/wiki/File:47_A_0_-stereo.wav