Song ratings

[TheOldPresbyope]

Basically, to enable this through MPD you have to

1. convince the MPD developer that a new MPD tag is needed by posting an issue and arguing persuasively for action. This gets it into the documentation. (Note: this step is not for the fainthearted. I and others have suffered humiliation at the hands of the BDFL when we failed to be sufficiently well prepared.)
   
2. create pull requests for changes to the existing MPD plugins to deal with the new tag---or convince others to do so
   
3. get the PRs accepted into the MPD codebase
   
4. make sure that your software app (moOde in this case) is using a new enough version of MPD to realize the fruits of your labor
   

Not to say it can't be done. Some time ago, I made it past step 1 when I succeeded in getting "work" added to the MPD tagset, arguing on the basis both of use cases and of its existence in musicology and the recording industry. Fortunately, I had an accepted definition I could point to.

This tag makes possible a sensible mark up of classical music, operas, etc., where  a single, titled work is composed of multiple tracks, each with its own title. Without it, one has to settle for album title as a substitute. Semantic nonsense, of course, and a ploy which often breaks down in practice because there was no "1 album = 1 work" rule in the recording industry. Not so big a problem in this age of streaming media, perhaps, but a biggie when dealing with tracks ripped from LPs and CDs.

I'm not comfortable enough with the MPD architecture and with C++ to propose PRs to the plugins myself. At one point I was building test files to see which MPD tags---not just mine but the entire list---are mapped from what fields in various metadata tagging schemes (ID3V2, VORBIS COMMENT, etc) but got stalled last year because of other activities (You know; what my grandkids call "IRL".). If I live long enough....

And now we return you to your regularly scheduled program.

Regards,
Kent