Why Does My iPhone Creates High Pitched Sounds When Playing Music. Here's The Fix.
It is possible that you have turned the Equalizer settings ON that caused it to play high pitched sounds. Go to Settings -> Music -> Under Playback -> EQ and see if it’s ON and set to pre-installed settings. If it is, try turning it OFF and play the music again.
Also, try playing it on a different device and if it sounds the same, it could be a corrupted music file problem or a recording issue.