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I can see that we can put an MP4 video on the website, but we can not put MP3 audio files on the website. Why?

I can see that we can put an MP4 video on the website, but we can not put MP3 audio files on the website. Why can’t we do that?? I do a church website, and I have a lot of audio files to put on the site. But I can’t do it. I have tried to do this audio as a youtube video, but the audio is more than 1 hour so it don’t works on youtube. So what to do?