By using this "if loop " , you actually what is the file type, and if the file type is the specified one then allow the process else do something else.
I think why to use it, must be clear to you by this now.
And you saying when you not using this if loop you are able to upload all the files except the MP3, maybe with this MP3 file you are violating the file size limit.
echo your file element and post it's contents here with this file
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