'Metadata json file for multimedia

Does anyone have the metadata requirements (.json) for a multimedia file, say an mp3?

Here is a sample for a PNG NFT:

{
    "name": "#1",
    "description": "Test NFT",
    "image": "http://digi.com/nft/1.png",
    "dna": "71d5dc83af1979a77787ae4c7a755csdd128a01b",
    "edition": 1,
    "date": 1642304242427
}

What is the key in the json file required to point to the actual mp3 file.

For images its "image"

json metadata mp3

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'Metadata json file for multimedia

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