I don't think this issue has been reported for Minecraft Java yet, but I was just chilling in my 1.16 singleplayer world when I heard this weird soundtrack, which is for the nether, playing in the overworld. A link to a video of me going to the nether and coming back to see if it was still there in the nether or if it continued playing when I went back to the overworld: https://www.mediafire.com/file/tc0zuji5oy8rrr5/Minecraft_1.16_-_Singleplayer%3B_Nether_Playing_in_Overworld_Report.mp4/file
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I have a similar video now. I managed to record it in my hardcore world.
https://www.mediafire.com/file/5rv405z07hyjkje/Minecraft_1.16.1_-_Multiplayer_Report.mp4/file
That's not nether music, that is Aquatic music. My apologies, I misidentified the song in the first video, both of them are from the Aquatic soundtrack, not the Nether one.
Are you using any resource pack?