Public bug reported:

I have many .ogg music files with valid metadata, but the metadata does not 
appear in the Clementine "Library" nor playlist queue display.  ie. the 
following file:
{{{
$ ogginfo 02-Sisters_of_Mercy.ogg 
Processing file "02-Sisters_of_Mercy.ogg"...

New logical stream (#1, serial: 00007da8): type vorbis
Vorbis headers parsed for stream 1, information follows...
Version: 0
Vendor: Xiphophorus libVorbis I 20011231 (1.0 rc3)
Channels: 2
Rate: 44100

Nominal bitrate: 160.032000 kb/s
Upper bitrate: 4294967.295000 kb/s
Lower bitrate: 4294967.295000 kb/s
User comments section follows...
        ALBUM=The Best of Leonard Cohen
        ARTIST=Leonard Cohen
        DATE=1975
        GENRE=Folk
        TITLE=Sisters of Mercy
        TRACKNUMBER=02
Vorbis stream 1:
        Total data length: 4293559 bytes
        Playback length: 3m:36.106s
        Average bitrate: 158.942214 kb/s
Logical stream 1 ended
}}}

... appears in the "Unknown" part of the Library feature, and when
queued appears with title "02-Sisters_of_Mercy.ogg" and length "3:36"
but no Artist nor Album.

If I use Clementine's tool for editing information, and make an inconsequential 
change, I see that Clementine adds a new tag:
{{{
$ vorbiscomment -l 02-Sisters_of_Mercy.ogg 
ALBUM=The Best of Leonard Cohen
ARTIST=Leonard Cohen
COMPILATION=0
DATE=1975
GENRE=Folk
TITLE=Sisters of Mercy
TRACKNUMBER=2
}}}

If I use `vorbiscomment -a -t "COMPILATION=0"` to change other ogg
vorbis files, the "Library" and playlist in Clementine updates and
populates the UI with the metadata.

According to the Vorbis Comment spec, "COMPILATION" is not a required field, so 
I feel Clementine should not refuse to process the other valid metadata if this 
tag is absent.
https://xiph.org/vorbis/doc/v-comment.html


Workaround:  write a bashscript to add the superfluous "COMPILATION=0" tag to 
all my *.ogg files.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: clementine 1.3.1+git276-g3485bbe43+dfsg-1
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Jan 21 15:26:57 2018
InstallationDate: Installed on 2016-06-05 (595 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: clementine
UpgradeStatus: Upgraded to artful on 2017-10-22 (91 days ago)

** Affects: clementine (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1744595

Title:
  (ogg) vorbis metadata in music ignored if "COMPILATION" is absent

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