Foobar2000:Encouraged Tag Standards

Discussion and comments

You can leave comments about this page on the Talk page. However, real discussion, proposals for new tag-standards, and decisions should happen in the forum-thread, because more people will notice it there and be able to give input.

General Tag Construction

Use an easily understood English field name.
Prefix album-related information with "ALBUM ", ie. "ALBUM ARTIST", "ALBUM SUBTITLE".
Avoid use of non-alphabetical characters. For serial fields (for a bad example, FIELD1, FIELD2, etc.), merely enter them in the order that you wish them to be read in.
Try to avoid the use of underscores. Spaces are easier to type, more legible, and as easily useable in Tagz. Spaces are also preferable to no spaces.

Overview of Current Recommendations

FIELD NAME [format] (component)

ALBUM ARTIST [e.g., Various Artists, The Foobar Collective] (none)
Notes: Field name is ALBUM ARTIST, with no underscore. Tag should exist if and only if an album is by multiple artists, and be contained in every track. Track-specific artists should be entered in the ARTIST tag, never in the TITLE tag.
(more about this standard)
FIRST_PLAYED and LAST_PLAYED [2005-03-22 19:00:00...] (foo_playcount)
Notes: These two tags use underscores instead of spaces - reason for this was to make it consistent with the already existing PLAY_COUNTER-tag. Any amount or type of data may be placed after the time. Compliant TAGZ code shall use $substr() instead of $right() when extracting substrings from this field.
See also: Standardize my PLAY_DATE and PLAY_TIME fields
(more about this standard)

ALBUM ARTIST

Basics:

the tag-fieldname used for declaring and describing albums/split-EPs or split-singles which contain various artists is "ALBUM ARTIST" (seperated with space, not underscore)
tag should only exist if an album contains various artists. It should NOT be created when an album does not contain various artists.
the tag can contain the overall artist of an album(like i.e. "the foo-bar collective"), multiple artists(i.e. with split-EPs) or if an album does not have a clear overall artist (for example with compilations) just "Various Artists". Simply said: you're free to enter whatever you like as long as it describes the overall album-wide artist(s).
every track in a V.A.-album has to contain this tag with the same value
the track-specific artist should be entered into the ARTIST-tag
the TITLE-tag should only contain the track-title

Reasons for this standard:

it solves all issues regarding albums which contain multiple artists with just one tag
it is already in widespread use
sortable and searchable with low effort
keeping the ARTIST-tag trackspecific allows to find tracks in V.A.-albums as well when searching for a certain artist (DB-friendly)
keeping the TITLE-tag title-specific allows sorting and searching of V.A.-albums by title (DB-friendly)
allows meaningful determination and display of V.A.-Albums with a minimum amount of code
avoids resource-hungry and unsafe "guessing" of V.A.-albums via the filepath
easy to remember and type in manually
does not disrupt existing systems when the ARTIST- and TITLE-tag are already trackspecific (easy transition)
can coexist with additional directory-based sorting and marking
can be used for split-EPs and split-singles as well

Code snippets:

// check if an album is V.A.
$if(%album artist%,$puts(album_is_va,1))

// For sorting by artist in an album-context replace %artist% - %album% with:
$if2(%album artist%,%artist%) - %album%

// singlemode display without %album artist%-support
[%artist% - ][%album% - ][%title%]
// singlemode display with %album artist%-support
// note: if your display supports both, albummode and singlemode, then you
// may want to use the above version instead in singlemode - depends on taste
[$if2(%album artist%,%artist%) - ][%album% - ]$if(%album artist%,[%artist% - ])[%title%]

// How to easily integrate %album artist% into an albummode-display:
// in the albummode-column, replace %artist% with:
$if2(%album artist%,[%artist%])
// in the title-column, replace %title% with:
$if(%album artist%,[%artist% - ])[%title%]

FIRST_PLAYED and LAST_PLAYED

Basics:

the tag-fieldname used for storing info when a song was played the last time is "LAST_PLAYED"
tag contains date and time in the following format at the beginning: "YYYY-MM-DD HH:MM:SS" (with 24hours-format)
additional info may be appended after the above info

Reasons for this standard:

the APE-dateformat (derived from ISO) is internationally neutral
sortable
easily readable and recognizable
format can be verified with TAGZ
can be included in formatting-strings without reformatting it (pro for amateur tagz-coders)
choosing a new fieldname avoids confusion with the existing ambigious play_date tag
field name is easy to understand/recognize/remember and short enough to type in manually

Code snippets:

// verify tag-format (we check the pos. of the first dash and ":")
// using $len for verification is strongly unrecommended!
$if(
$and($strcmp($strstr(%last_played%,-),5),$strcmp($strstr(%last_played%,:),14))
,$puts(last_played_is_valid,1)
)

// disassemble the timestamp for later reformatting or calcuations
$puts(last_played_year,$substr(%last_played%,1,4))
$puts(last_played_month,$substr(%last_played%,6,7))
$puts(last_played_day,$substr(%last_played%,9,10))
$puts(last_played_hour,$substr(%last_played%,12,13))
$puts(last_played_min,$substr(%last_played%,15,16))
$puts(last_played_sec,$substr(%last_played%,18,19))

// display only the date of last_played (without reformatting)
$left(%last_played%,10)

// display only the time of last_played (without reformatting)
// the use of $right is strongly unrecommended!
$substr(%last_played%,12,19)

The above code-snippets can be used for FIRST_PLAYED as well (just replace last_played with first_played).

Obsolete and Deprecated Tag Standards

PLAY_DATE and PLAY_TIME

Deprecated tags produced by old versions of foo_playcount. Default format DDMMYY for PLAY_DATE and HHMMSS (24hr) for PLAY_TIME. See LAST_PLAYED.