| Const ARTIST: | Artist name. |
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| Const ALBUM_ID: | Album ID. Only if known. |
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| Const ALBUM_REPLAY_GAIN: |
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| | Replay gain of the album (in dB), if any |
| Const ALBUM: | Album name. Only if known. |
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| Const ARTIST_ID: |
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| | Artist ID. |
| Const ARTIST_ROLE_IDS: |
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| | For each role as defined above, the list of ids. |
| Const ARTIST_ROLE: |
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| | a comma separated list of names. |
| Const ARTWORK_TRACK_ID: |
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| | Identifier of the album track used by the server to display the album’s artwork. Not listed if artwork is not available for this album. |
| Const ARTWORK_URL: |
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| | A full URL to remote artwork. Only available for certain plugins such as Pandora and Rhapsody. |
| Const BITRATE: | Song bitrate. Only if known. |
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| Const BPM: | Beats per minute. Only if known. |
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| Const BUTTONS: | A hash with button definitions. Only available for certain plugins such as Pandora. |
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| Const COMMENT: | Song comments, if any. |
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| Const COMPILATION: |
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| | 1 if the album this track belongs to is a compilation |
| Const CONTENT_TYPE: |
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| | Content type. Only if known. |
| Const COVERART: | 1 if coverart is available for this song. Not listed otherwise. |
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| Const COVERID: | coverid to use when constructing an artwork URL, such as /music/$coverid/cover.jpg |
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| Const DISC_COUNT: |
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| | Number of discs. Only if known. |
| Const DISC: | Disc number. Only if known. |
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| Const DURATION: | Song duration in seconds. |
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| Const FILESIZE: | Song file length in bytes. Only if known. |
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| Const GENRE_ID_LIST: |
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| | Genre IDs, separated by commas (only useful if the server is set to handle multiple items in tags). |
| Const GENRE_ID: | Genre ID. Only if known. |
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| Const GENRE_LIST: |
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| | Genre names, separated by commas (only useful if the server is set to handle multiple items in tags). |
| Const GENRE: | Genre name. Only if known. |
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| Const INFO_LINK: |
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| | A custom link to use for trackinfo. Only available for certain plugins such as Pandora. |
| Const LYRICS: | Lyrics. Only if known. |
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| Const MODIFICATION_TIME: |
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| | Date and time song file was last changed. |
| Const MUSICMAGIC_MIXABLE: |
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| | 1 if track is mixable, otherwise 0. |
| Const RATING: | Song rating, if known and greater than 0. |
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| Const REMOTE_TITLE: |
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| | Title of the internet radio station. |
| Const REMOTE: | If 1, this is a remote track. |
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| Const REPLAY_GAIN: |
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| | Replay gain (in dB), if any |
| Const SAMPLERATE: |
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| | Song sample rate (in KHz) |
| Const SAMPLESIZE: |
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| | Song sample size (in bits) |
| Const TAG_VERSION: |
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| | Version of tag information in song file. Only if known. |
| Const TRACK_NUMBER: |
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| | Track number. Only if known. |
| Const URL: | Song file url. |
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| Const YEAR: | Song year. Only if known. |
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