This sound effect can be found on Orchestral Colours, which was made by Best Service.
https://soundeffects.fandom.com/wiki/File:68_C_MIN-stereo.wav https://soundeffects.fandom.com/wiki/File:68_D-sharp_MIN-stereo.wav https://soundeffects.fandom.com/wiki/File:68_F-sharp_MIN-stereo.wav https://soundeffects.fandom.com/wiki/File:68_A_MIN-stereo.wav