Video recording has 2 audio in it

Looking for support or advice for an important issue that I’m facing with a video that I recorded using my Iphone 13 camera. I recorded the video (a very memorable one) yesterday at a party and it was a loud floor.

After coming home while playing the video, I was extremely disappointed that I could hear 2 audio in it. One was the actual audio of the performance I was capturing and another audio was a song that was playing on my gmail app which I opened on the app and left playing even while I was recording (unknowingly). As mentioned, it was a loud place, so I didn’t hear the feeble sound of the song that was still playing on my phone even while I was recording the video. 

In all these years of using different iPhones since 3G, I always have known that any media files will stop automatically when we enable photo or video through camera. It was absolutely disheartening to learn or know that one of the background media which was playing could take up the audio space while I record a video in real. 

Is this a know issue?

Is there a way the audio can rectified? - reason being it is a most memorable video of little ones singing together. 

Truly speaking, any valuable help or suggestion to fix the video is much much greatly appreciated. Please provide your comments or experience about this issue.