a) hopefully you didn’t install it as internal storage.
b) try downloading a different music. if you are ok with downloading an apk and installing you may like to try.
https://apkpure.com/free-music-player-mp3-player/freemusic.download.musicplayer.mp3player
and/or
https://apkpure.com/simple-music-player-play-audio-files-easily/com.simplemobiletools.musicplayer
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