I propose to add 3 new fields to the specification to clarify vital musical metadata.

name: title (Useful when song title is different than NFT name)
type: text

name: album
type: text

name: track (Number of the track on album)
type: integer

cXc Music NFT Recommendation 0.1.2 Complete Schem

[
    {
      "name": "name",
      "type": "string"
    },
    {
      "name": "img",
      "type": "image"
    },
    {
      "name": "audio",
      "type": "ipfs"
    },
    {
      "name": "video",
      "type": "ipfs"
    },
    {
      "name": "backimg",
      "type": "image"
    },
    {
      "name": "promo",
      "type": "image"
    },
    {
      "name": "title",
      "type": "string"
    },
    {
      "name": "album",
      "type": "string"
    },
    {
      "name": "track",
      "type": "int64"
    },
    {
      "name": "about",
      "type": "string"
    },
    {
      "name": "credits",
      "type": "string[]"
    },
    {
      "name": "youtube",
      "type": "string"
    },
    {
      "name": "spotify",
      "type": "string"
    },
    {
      "name": "soundcloud",
      "type": "string"
    },
    {
      "name": "platforms",
      "type": "string[]"
    },
    {
      "name": "nation",
      "type": "string"
    },
    {
      "name": "locale",
      "type": "string"
    },
    {
      "name": "geoloc",
      "type": "string"
    },
    {
      "name": "license",
      "type": "string"
    },
    {
      "name": "rarity",
      "type": "string"
    }
  ]