m4a, id3v1, and id3v2 tags

gistfile1.js

{
  "count": 36453,
  "m4a": {
    "©nam": 24594,
    "©ART": 23883,
    "©alb": 24266,
    "gnre": 15687,
    "trkn": 24457,
    "disk": 19508,
    "©day": 20734,
    "cpil": 24473,
    "pgap": 24091,
    "tmpo": 24163,
    "©too": 24267,
    "----[com.apple.iTunes;iTunSMPB]": 24084,
    "----[com.apple.iTunes;EncodingParams]": 21362,
    "----[com.apple.iTunes;iTunNORM]": 24471,
    "----[com.apple.iTunes;iTunes_CDDB_IDs]": 21324,
    "----[com.apple.iTunes;UFIDhttp://www.cddb.com/id3/taginfo1.html]": 19437,
    "stream": 36453,
    "fileMd5sum": 36453,
    "©wrt": 15074,
    "©gen": 7669,
    "----[com.apple.iTunes;UFIDhttp://www.cddb.com/id3/taginfo.html]": 1009,
    "aART": 1294,
    "apID": 311,
    "cprt": 309,
    "cnID": 311,
    "rtng": 311,
    "atID": 311,
    "plID": 311,
    "geID": 311,
    "sfID": 311,
    "akID": 311,
    "stik": 311,
    "purd": 311,
    "xid": 134,
    "----[com.apple.iTunes;iTunMOVI]": 303,
    "covr": 1043,
    "----[com.apple.iTunes;iTunes_CDDB_1]": 1237,
    "----[com.apple.iTunes;iTunes_CDDB_TrackNumber]": 1237,
    "cmID": 144,
    "soal": 36,
    "----[com.apple.iTunes;MusicIPPUID]": 206,
    "----[com.apple.iTunes;MusicBrainzArtistId]": 228,
    "----[com.apple.iTunes;MusicBrainzAlbumArtistId]": 228,
    "----[com.apple.iTunes;MusicBrainzAlbumId]": 228,
    "----[com.apple.iTunes;MusicBrainzTrackId]": 228,
    "----[com.apple.iTunes;CATALOGNUMBER]": 116,
    "----[com.apple.iTunes;LABEL]": 158,
    "----[com.apple.iTunes;ASIN]": 208,
    "----[com.apple.iTunes;MusicBrainzAlbumReleaseCountry]": 228,
    "----[com.apple.iTunes;MusicBrainzAlbumType]": 228,
    "----[com.apple.iTunes;MusicBrainzAlbumStatus]": 228,
    "----[com.apple.iTunes;ENGINEER]": 20,
    "soaa": 228,
    "soar": 249,
    "----[com.apple.iTunes;BARCODE]": 48,
    "sonm": 13,
    "©cmt": 35,
    "----[com.apple.iTunes;tool]": 31,
    "tvsn": 1,
    "tves": 1,
    "rndu": 1,
    "rpdu": 1,
    "----[com.apple.iTunes;PRODUCER]": 20,
    "----[com.apple.iTunes;MIXER]": 20
  },
  "id3v1": {
    "Title": 6492,
    "Artist": 6492,
    "Album": 6492,
    "Comment": 6492,
    "Genre": 6492,
    "Year": 6492,
    "Track": 6492
  },
  "id3v2": {
    "TCOM": 5247,
    "TIT2": 10000,
    "TCOP": 4363,
    "TCON": 7742,
    "TPE1": 9703,
    "TPE3": 3727,
    "TALB": 9507,
    "COMM": 7945,
    "TRCK": 9407,
    "APIC": 5249,
    "TPE2": 4212,
    "TPOS": 5661,
    "TDRC": 7675,
    "WPUB": 466,
    "TLEN": 1481,
    "TPUB": 824,
    "WCOP": 465,
    "NCON": 304,
    "TENC": 1472,
    "PRIV": 1214,
    "TBPM": 1618,
    "TLAN": 173,
    "TIT1": 307,
    "USLT": 221,
    "TIT3": 264,
    "TKWD": 161,
    "PCST": 232,
    "TDES": 225,
    "TGID": 235,
    "WFED": 235,
    "WXXX": 267,
    "TOPE": 176,
    "TMED": 32,
    "TCP": 218,
    "TXXX": 2411,
    "UFID": 2271,
    "TSOP": 2205,
    "TSSE": 358,
    "TOWN": 64,
    "WOAR": 66,
    "GEOB": 54,
    "MCDI": 535,
    "TCMP": 132,
    "TDR": 40,
    "PCS": 40,
    "TCT": 23,
    "TKW": 21,
    "TDS": 36,
    "TID": 40,
    "WFD": 40,
    "TDRL": 65,
    "TKEY": 35,
    "POPM": 44,
    "TFLT": 23,
    "WCOM": 20,
    "TOAL": 2,
    "TMOO": 8,
    "PCNT": 10,
    "TYER": 1,
    "CM1": 9,
    "WOAF": 3,
    "WOAS": 2,
    "TCAT": 4,
    "ITNU": 3,
    "WORS": 1
  }
}